Transcript Reliability Degradation

National Public Safety Telecommunications Council
RPC Training Session: Topic I
Tile Based Coordination of 700 MHZ
Public Safety Spectrum
(with TSB-88 Concepts)
Denver, CO, June 11, 2007
Sean O’Hara
NPSTC Technical Support
Regions 8, 19, 28, 30 and 55
SRC - State of New York - SWN
Syracuse Research Corporation
315-452-8152 (office)
[email protected]
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Introduction
• Purpose
– Introduce RPCs to techniques and requirements for handling detailed
coordination and coexistence of diverse 700 MHz technologies
– This whole process has gotten quite complicated
– This will only provide an overview
• Relevancy
– 700 MHz spectrum will be deployed for more flexible use, and with a
greater variety of bandwidth configurations
– We have an immediate need to manage these issues
• Audience
– Technical
– System Operators, RPC Technical Committee Members, Frequency
Coordinators, Spectrum and System Planners, etc
• Collaboration
– These concepts were developed in collaboration with many Regions
– These concepts were developed by folks very active within TR-18.18
(TSB-88)
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Overview and Schedule
Topic
Time
Introduction and Overview
5 minutes
Need for Accurate Coordination at 700 MHz
5 minutes
Using Communications “Reliability” as a Metric
20 minutes
Technology and Adjacent Channel Effects
15 minutes
Tile-Based Coordination Approach
(Region 8, 30, 55)
15 minutes
Examples
10 minutes
Questions and Answers and Feedback
5 minutes
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National Public Safety Telecommunications Council
Need for Accurate
Coordination at 700 MHz
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700 MHz Coordination
• It is up to us (the RPCs) to manage the 700 MHz
spectrum effectively
• If we do not…
– Interference will result
– Regional capacity will drop
– Deployment flexibility will go out the window
• The 700 MHz Pool was generated to maximize spectrum
availability
– It assumes responsible deployment of this precious spectrum
resource
– Its interference constraints must be followed
• The FCC gives us basic Rules – We can impose
whatever else we need in order to manage the spectrum
– It has been given to us to manage
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700 MHz Pool Allotments
• For nearly all of the US, all near term
applications must be consistent with the
CAPRAD pool allotments
– Each application must be consistent with the
pool until the Region(s) decides otherwise
• Inter-regional coordination may be based
upon these pool allotments for quite a
while
– But these are not a replacement for either
communications or proper coordination
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What Are the “Allotments”?
• Each County allotment:
– Is a contiguous 25-kHz Block, providing
• (4) 6.25 kHz channels, or
• (2) 12.5 kHz channels, or
• (1) 25-kHz channel
– Maintains at least 250 kHz separation with all other allotments
within each county
• Each County (except PR/VI) received a minimum of five of
these 25-kHz blocks
– The remainder were allotted according to the capacity model, and
reuse constraints
• Maximum reuse for responsible utilization
– County size, terrain and US borders do affect availability
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Region 8 Area
700 MHz Channel Allotment Pool
Allotment Pool Size (25-kHz Blocks)
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
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Region 8 Area
700 MHz Channel Allotment Pool
5
10
10
18
19
10
7
8
16
5
10
7
8
8
11
6
7
10
19
5
5
9
10
21
18
8
6
7
18
5
12
5
11
7
6
5
7
6
9
10
11
13
12
8
7
9
16
10
18
8
7
7
7
5
12
7
6
6
5
5
11
8
5
5
9
5
13
11
10
13
9
6
5
11
5
12
5
8
7
10
13
5 15 10
17
17
10
6
7
7
8
13
8
7
9
10
11
6
10
13
16
13
20
6
10
6
5
7
14
12
6
5
5
8
10
5
13
5
6
8
6
5
5
6
9
6
5
16
15
17
5
13
7
6
14
6
8
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Example of Reuse - NE United States,
Channel Block 142 (On-Channel Allotments)
The allotments were packed
according to Rules that
included:
Service and Interference
Contours that utilized terrain,
political boundaries, and
geographic separation
constraints
Modeled Capacity Needs
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The Pool Assignments are PACKED
Example: Block 52
NYC (NY), New Haven (CT), Burlington (NJ), Berks (PA)
Co- and Adjacent-Channel Case, Channel Block 52
41.5
Latitude
41
40.5
40
Co-Channel Blocks
39.5
50-km
-76
-75
-74
-73
-72
-71
Black: Co-Channel Interference, Red: Co-Channel Service, Blue: Adj-Channel Service
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National Public Safety Telecommunications Council
Using Communications
“Reliability” as a Metric
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Coverage is a Complicated Concept
• Coverage is a random process
– Each location within the state is defined by a coverage
“reliability”, which is a probability of achieving a particular level of
performance at that location
• Coverage is actually interference limited
– Coverage reliability is dependent upon the reuse of spectrum
resources
• Coverage is multi-dimensional
– Depends upon the entire collection of received signal, both
desired and undesired
– Relationships are very complex
• Coverage changes as the system evolves
– Adding/changing sites, frequencies, etc
– Internal and external to any given system
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How Can You Look at Coverage?
• Traditionally, we used contours
– 800 MHz NPSPAC: Okumura 40 dBu, 25 dBu, 5 dBu
– These gave us no details regarding either coverage or interference
• Then, we used propagation models and tile studies
– But in most cases, these were still treated as contours
• We really need to look at Reliability
– Noise Limited Reliability
– Interference Limited Reliability
– Reliability Degradation from Noise Limited to Interference Limited
• How?
– What makes up “Reliability”
– What makes up an interfering condition
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Contours and Tile Studies
• Contours
– Closed polygons representing service areas and/or interference
regions
– Various types are used
• Regulatory and regional planning
• System design (tile based)
• Tile Studies
– Most accurate way to manage the spectrum
– Used for
• Siting/System design,
• Coverage/Interference prediction, reliability estimation,
• Spectrum reuse planning
– Various models are available
• Many commercial packages
• But few standardized algorithms
– Complex and time consuming when large systems are involved.
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Multiple Site C/N
No
Interference
(Noise-Only)
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Multiple Site C/(N+I)
Note the
Loss in
Reliability
and
Coverage
Interference
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Tile/Propagation Analysis
• GOAL: ESTIMATE COMMUNICATIONS RELIABILITY
– Performance in the presence of fading, noise and interference
• Voice quality, data rate, etc
– Fading usually wrapped into Channel Performance Criterion
(CPCf)
• Reliability is mainly dependent on:
–
–
–
–
CPCf (a technology and QoS-dependent faded S/(I+N) metric)
Overall receiver system noise floor
Received desired power and interference power
Local variance of each of the desired signal and interference
sources
• Reliability is a direct function of margin over CPC
– Margin = S/(I+N)attained - S/(I+N)required
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Reliability Margin:
Tile by-Tile Evaluation
Level (dBm)
-95
Note:
Desired
Antenna adjustments (i.e.
portable and sometimes building
loss) lower both the desired and
undesired signal, leaving S/I
unchanged
Faded CPC Criterion
-105
-115
Antenna Loss
N+I Margin
-120
Noise Margin
Antenna Loss
-125
Receiver Floor, N
Receiver NF
-135
I+N
kTB (ENBW)
Interference
Or Site Noise
Antenna Loss
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Interference can be be cochannel, and/or near or far
adjacent. If adjacent then
ACCPR must be computed
The DESIRED and the
INTERFERING signals are either
modeled or measured
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Aggregate Coverage Example
As previously stated, coverage is a
complex concept.
Lets look at small set of
“coverage” tiles to see
how this all comes
together.
Lets take one tile as an
example…
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Example: Talk Out Coverage
Each tile is served by multiple sites on
multiple frequencies – each with a different
reliability for mobile and portable
operations.
F4’
F4
F1
F3’
F1’
F1’
F3
F2
Desired Signals
Undesired Signals
F2’
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The overall tile reliability
depends upon all of the
individual reliabilities
As determined through
Monte Carlo analyses (via
TSB-88 methods)
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Coverage Discretization
This output grid gives a
continuous gradient of system
coverage reliability
Notice that the
coverage is NOT
“Black and White”
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Coverage Discretization
This “black and white” point is
important when we look at a
tiled reliability output against a
critical resource location
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Coverage Discretization
A discrete “black and white” analysis
could show how many tiles intersecting
the critical area have less than some set
degree of coverage
E.g.
29 total area units in critical location
4 tiles at less than 95% reliability
86% of the critical location at
sufficient coverage levels
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Coverage Discretization
A continuous analysis could show the
overall reliability of tiles of the coverage
of the critical location
E.g.
29 total area units in critical location
Average tile reliability of 93%
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What is an Interference Condition?
•
•
TSB-88 defines a reduction in reliability
How much of a reduction is unacceptable?
– 1%?
•
2%?
10%?
What is the protected “Service Area” (PSA) of an incumbent or
applicant?
– 40 dBu Contour
– Jurisdictional Area
– Set of tiles with some defined reliability (e.g. > 65%)
• everywhere, or only within PSA?
– Other?
•
What interferers should be considered when evaluating Reliability
Degradation?
– All (cumulative interference)?
• Most accurate, and most time consuming
– Only the current application?
• Fastest and least accurate, is we are doing at 800 MHz
•
Seem complex?
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Reliability Degradation
• Q: What the heck is Reliability Degradation?
• A: It is a a reality-based measure of actual
interference effects
• It is based upon TSB-88 concepts
–
–
–
–
–
Communications reliability
Tile based interference assessment
Equivalent interferer combination
Technology to technology ACCPR effects
Protection afforded only where service area exists, not over
an entire IMAGINARY contour
– Design to S/(I+N), not simple contour intersections
• Maximizes reuse, while offering accurate
interference assessments
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Consistency and Stability
of Reliability Degradation
Example: Compare RD impacts between 1500 radio transmitter sites
using two different models:
Longley Rice v1.2.2 and RAPTR
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Consistency and Stability
of Reliability Degradation
• For Adjacent channel
– 99.3% of points with RD difference < 0.1%
– 99.5% of points with RD difference < 1%
– 99.9% of points with RD difference < 10%
• For Co channel
– 96.0% of points with RD difference < 0.1%
– 97.3% of points with RD difference < 1%
– 99.3% of points with RD difference < 10%
• Conclusion, two very different propagation models give
nearly identical results when RD is employed
– Normal contours and/or propagation modeling gives widely
varying results
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Measures of Reliability Degradation
• Reliability degradation can be measured in at
least two ways
– Percent Reliability Degradation (PRD): Average
reduction in reliability over a service area
• Over a service area, compute the average of the
difference between the noise and interference limited tile
reliabilities
– Area Reliability Degradation (ARD): Average
reduction in service area meeting a set Reliability
threshold
• Over a service area, compute the ratio of the difference
in interference and noise limited area served at a
particular reliability level
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Technology and
Adjacent Channel Effects
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Size and Technology Matters
• We have a lot more technology options at 700
MHz than we have been used to in the past
• Bandwidth configurations that can support
many combinations of TDMA and FDMA
– Each specific technology has a specific CPCf and
IF filter model associated with it
• There are also the same types of system
design choices that we had at 800 MHz
– High sites and/or low sites
– Portable and/or mobile designs
– Simulcast and multicast designs
• These all have an impact on coordination
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Technology and Design Considerations
Example 1
~1200 mi2
18-25 kHz Channel Pool
High Site Design
5 Sites
Multicast:
7-12.5’s / site
14-6.25’s / site
(TDMA or FDMA)
No Reuse
8 mi
5 mi
Single Zone Simulcast, 18-25’s / site
Two Zone Simulcast, 18-12.5’s / site
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Technology and Design Considerations
Example 2
18-25 Channel Pool
Low Site Design
22 Sites, 7 Cell Cluster
~18 dB C/I
Multicast:
5-12.5 per site
10-6.25 per site
(TDMA or FDMA)
~1200 mi2
3 System Simulcast:
12-12.5 per Site
3.7 mi
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6.25 kHz FDMA Multicast
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
Site
1
2
3
4
5
#
15 Chans
15 Chans
14 Chans
14 Chans
14 Chans
Min Site Sep
>225 kHz
>225 kHz
>225 kHz
>225 kHz
>225 kHz
14-15 Voice Paths/Site
72 Total
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12.5 kHz TDMA/FDMA Multicast
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
Site
1
2
3
4
5
#
8 Chans
7 Chans
7 Chans
7 Chans
7 Chans
Min Site Sep
>500 kHz
>500 kHz
>500 kHz
>500 kHz
>500 kHz
FDMA: 7-8 Voice Paths/Site
36 Total
TDMA: 14-16 Voice Paths/Site
72 Total
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6.25 kHz FDMA Multicast Cellular
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
Site
1
2
3
4
5
6
7
#
11 Chans
11 Chans
10 Chans
10 Chans
10 Chans
10 Chans
10 Chans
Min Site Sep
>225 kHz
>225 kHz
>225 kHz
>225 kHz
>225 kHz
>225 kHz
>225 kHz
10-11 Voice Paths/Site
72 Total
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12.5 kHz FDMA/TDMA Multicast Cellular
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Site
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
1
2
3
4
5
6
7
#
6 Chans
5 Chans
5 Chans
5 Chans
5 Chans
5 Chans
5 Chans
Min Site Sep
>1MHz
>1MHz
>1MHz
>1MHz
>1MHz
>1MHz
>1MHz
FDMA: 5-6 Voice Paths/Site
36 Total
TDMA: 10-12 Voice Paths/Site
72 Total
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Single-Zone 12.5 and 25 kHz Simulcast
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Site
1
#
18 Chans
Min Site Sep
250 kHz
FDMA: 18 Voice Paths
TDMA: 36-72 Voice Paths
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Multi-Zone Simulcast
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Site
1
2
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
#
9 Chans
9 Chans
Min Site Sep
250 kHz
FDMA: 9 Voice Paths/Site
18 Total
TDMA: 18-36 Voice Paths/Site
36-72 Total
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
Site
1
2
Min Site
Sep
#
18 Chans 250 kHz
18 Chans 250 kHz
FDMA: 18 Voice Paths/Site
36 Total
TDMA: 36 Voice Paths/Site
72 Total
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1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Block
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Site
1
2
3
1
1
1
1
1
1
2
2
2
2
2
2
3
3
3
3
3
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
#
6 Chans
6 Chans
6 Chans
Min Site Sep
250 kHz
250 kHz
250 kHz
FDMA: 6 Voice Paths/Site
18 Total
TDMA:12-24 Voice Paths/Site
36-72 Total
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
45
Site
1
2
3
Min Site
Sep
#
12 Chans >500 kHz
12 Chans >500 kHz
12 Chans >500 kHz
FDMA: 12 Voice Paths/Site
36 Total
TDMA: 24 Voice Paths/Site
72 Total
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Technology Considerations
-Power Spectrum: Adjacent Channel Coupled Power
0
Power Gain and Normalized Interference PSD, Resolution BW: 0.0313 kHz
-50
ACCPR = -64.5882 dB
-100
-150
-200
-250
Interferer PSD, C4FM
Victim IF Filter, Root Raised Cosine
Intercepted Power
Integrated Power
Original Offset: 12.5 kHz
Offset w/Frequency Drift: 11.6979 kHz
-300
-60
-40
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-20
0
Frequency
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20
40
60
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Adjacent Channel Coupled Power
(12.5 kHz example P25 Phase I Transmitter)
ACCPR =-39 dB
0
-25
-25
kHz0.031
Power Gain and Normalized Interference PSD, Resolution3BW:
kHz
Power Gain and Normalized Interference PSD, Resolution BW: 30.031
ACCPR =-71 dB
0
-50
-75
P25 to “Wide”
~20 dB
-100
-125
-50
-75
-100
-125
Interferer PSD, C4FM
Victim IF Filter, Butterworth
Intercepted Power
Integrated Power
Interferer PSD, C4FM
Victim IF Filter, Root Raised Cosine
Intercepted Power
Integrated Power
-150
-50
-40
-30
-20
-10
0
Frequency
10
20
30
40
-150
-50
50
-40
-30
-20
-10
0
Frequency
10
20
30
40
50
ACCPR =-21 dB
0
P25 to FM
~40 dB
-25
kHz 0.031
Power Gain and Normalized Interference PSD, Resolution3BW:
P25 to P25
>65 dB
-50
-75
-100
-125
Interferer PSD, C4FM
Victim IF Filter, Root Raised Cosine
Intercepted Power
Integrated Power
-150
-50
-40
-30
-20
-10
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0
Frequency
10
20
30
40
50
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Transmitter Characteristics of Other Technologies
iDen
SAM
EDACS WIDEBAND
TETRA
CQPSK
Analog (2.5 kHz)
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Adjacent Channel Coordination at 700 MHz
• Nearly all 700 MHz
Narrowband technologies
provide better than 60 dB
of adjacent channel
protection
• In context of the old
contours methods this
means that to 40 dBu
service and 65 dBu
interference contours
cannot overlap
• In the tile analyses, you will
de-rate the interferer by the
ACCPR, then treat as cochannel
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40 dBu
Service
65 dBu
Interference
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Guidelines and Helpful Hints
• Get all the information you need from applicants
– System type
– Technology (CPC and IF Model)
• See Region 8/30/55 plan for defaults
– Service Area Boundary (usually political boundary)
– Antenna Pattern(s)
• Adjacent Channel Considerations
– You really only need to do detailed ACCPR analyses when service
areas overlap and channel offsets are less than 25-kHz
– Otherwise just examine co-channel impacts
• ACCPR Computations
– Use tables or Excel Tool from TSB-88
– Other options are available as well
• Simulcast Systems
– Victim: Treat simulcast systems as a single site.
– Interferer: Treat as individual interferers
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National Public Safety Telecommunications Council
Tile-Based Coordination Approach
(Region 8, 30, 55)
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General Region 8/30/55 Application
Process
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What Has Regions 8/30/55 Settled On?
(Propagation/Reliability Modeling)
• All analysis is tile based and will use the Longley-Rice
model in median (50,50,50) mode
– Need the accuracy so that interference can be carefully
modeled
– Need the accuracy so that frequency reuse is reasonable
• 50 dBµ levels must be 80% contained within the
service area
– Jurisdictional area plus 8-km
– Similar to the old 40 dBµ contour rule
– Necessary for responsible radiation control
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What Has Region 8/30/55 Settled On?
(Reliability Degradation)
• The metric chosen for reliability reduction
due to co and adjacent channel use is called
Area Reliability Degradation or ARD
– See next slide
• The selected ARD thresholds are different
for in-pool and out-of-pool applications
– For in-pool, 2.5% ARD per applicant, up to 5%
ARD total and cumulative
– For out-of-pool, 0%
• ARD is compared to noise limited
– Means less “state-tracking” is required
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What is ARD Again?
• ARD is a reduction in area reliability caused by co and adjacent
channel operations
• First, an incumbents reliable noise-limited coverage area is
determined using 3-second propagation analyses
– Example, noise limited service area for an incumbent may be found
to be 100-km2
– This represents the total area within their service area that falls at
90% reliability levels as determined by TSB-88
• Next, an applicants proposed operations are used to model the
reliable interference-limited coverage area of the incumbent,
again using 3-second propagation analyses
– Example, interference limited service area for the incumbent may be
found to be 98-km2
– This gives an ARD of 100*(1-98/100) or 2%
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Plan Sections
NOTE: These may differ slightly from the final version
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NOTE: These may differ slightly
from the finalwww.NPSTC.org
version
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Plan Sections: More on 9.4 (ARD)
NOTE: These may
differ slightly from
the final version
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What Does a Region 8/30/55
Application Contain?
• In order to do this complex processing, there is
more information required from an applicant
than there was at 800 MHz
– We have dedicated application forms that must be
filled out completely
• Detailed horizontal and vertical antenna pattern sheets
• Detailed Jurisdictional Area Boundary file, with buffer
included
• ARD analysis must be provided by applicant,
and WILL BE VERIFIED by the Regions
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Some Available Tools
• NYS-SWN has developed Matlab tools for performing
the ARD evaluations
– They are applying some serious spectrum engineering
horsepower in the SWN deployment…
• They will be compiling them into an easy to use stand
alone software package for free distribution to the RPCs
–
–
–
–
Government developed, with NYS-OFT Copyright
Installation/exe, all files, including terrain
Availability: In the next couple months
ONLY for RPC Application EVALUATION
• Talking with NPSTC to see who would like these, and if
they would be appropriate to perhaps put into CAPRAD
– Do you all think that this will be useful?
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Available Tools
Application
(ebf/601)
antenna.xls
boundary.xls
Input
CAPRAD
Timelines/Apps
Word Report(s)
Output
html Report(s)
Output
ULS/FCC
User only has to select
the application file(s)
emails
Output reports include
fully formatted text,
tables, and graphics
(propagation maps,
interference areas, etc)
Resident
Data
Terrain
(3-sec)
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Pool
Assignments
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National Public Safety Telecommunications Council
Examples
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Examples – 50 dBu Coverage
Essex County WNQS440, WNWC455 (Longley-Rice)
dBu
41.8
50
60
41.6
41.4
50
41.2
Latitude
40
41
30
40.8
40.6
20
40.4
25-km
10
40.2
40
-76
-75.5
-75
-74.5
-74
Longitude
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-72.5
-73
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Examples – 50 dBu Coverage
Essex County WNQS440, WNWC455
w/Okumura Suburban Knife Edge
dBu
41.8
50
60
41.6
41.4
50
41.2
Latitude
40
41
40.8
30
40.6
20
40.4
10
40.2
25-km
40
-76
-75.5
-75
-74.5
-74
Longitude
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-73
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Examples – 50 dBu Coverage
Middlesex County WNNM897 (Longley-Rice)
dBu
50
41
60
40.9
50
40.8
40.7
40
Latitude
40.6
40.5
30
40.4
40.3
20
40.2
40.1
10
25-km
40
-75.5
-75
-74.5
Longitude
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Examples – 50 dBu Coverage
Middlesex County WNNM897
w/Okumura Suburban Knife Edge
dBu
50
41
60
40.9
50
40.8
40.7
40
Latitude
40.6
40.5
30
40.4
40.3
20
40.2
40.1
40
10
25-km
-75.5
-75
-74.5
Longitude
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Examples:
Current Co-Channel Licenses
NJ Transit, WNSM959
Town of Wallingford, WPLZ699
800MHz Okumura Suburban at 25 dBu
800MHz Okumura Suburban at 40 dBu
800MHz Okumura Suburban at 5 dBu
42
41.8
41.6
Latitude
41.4
41.2
41
40.8
40.6
25-km
40.4
-75.5
Okumura-Hata-Davidson Contours
-75
-74.5
-74
-73.5
Longitude
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-72.5
-72
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-71.5
www.NPSTC.org
Examples:
Current Co-Channel Licenses
NJ Transit, WNSM959
Town of Wallingford, WPLZ699
dBu
42
50
40
5
41.8
60
50
41.6
41.4
40
Latitude
41.2
41
30
40.8
20
40.6
Okumura –Suburban
with Knife Edge
40.4
40.2
25-km
10
40
-75.5
-75
-74.5
-74
-73.5
Longitude
-73
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-72
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Examples:
Current Co-Channel Licenses
NJ Transit, WNSM959
Town of Wallingford, WPLZ699
42
41.8
dBu
50
40
5
Computes to 0% Area
Loss at 90% Reliability
60
50
41.6
41.4
40
Latitude
41.2
41
30
40.8
20
40.6
40.4
Longley-Rice
10
25-km
40.2
40
-75.5
-75
-74.5
-74
-73.5
Longitude
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-72
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Examples:
Current Co-Channel Licenses
State of CT, WPGU375
Town of Babylon, WQBX812
800MHz Okumura Suburban at 25 dBu
800MHz Okumura Suburban at 40 dBu
800MHz Okumura Suburban at 5 dBu
41.4
41.3
41.2
Latitude
41.1
41
40.9
40.8
40.7
40.6
25-km
Okumura-Hata-Davidson Contours
40.5
-73.8
-73.6
-73.4
-73.2
-73
-72.6
-72.8
Longitude
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-72.4
-72.2
-72
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Examples:
Current Co-Channel Licenses
State of CT, WPGU375
Town of Babylon, WQBX812
dBu
41.8
50
40
5
41.6
60
50
41.4
40
Latitude
41.2
41
30
40.8
20
40.6
40.4
Okumura –Suburban
with Knife Edge
25-km
-74.5
-74
-73.5
-73
Longitude
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-72
10
-71.5
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Examples:
Current Co-Channel Licenses
State of CT, WPGU375
Town of Babylon, WQBX812
dBu
41.8
41.6
50
40
5
Computes to 0% Area
Loss at 90% Reliability
60
50
41.4
40
Latitude
41.2
41
30
40.8
20
40.6
Longley-Rice
40.4
10
25-km
-74.5
-74
-73.5
-73
Longitude
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-72
-71.5
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Example: Possible Out-of-Pool Request on
Pool Block 48
Co- and Adjacent-Channel Case, Channel Block 48
43
42.5
42
41.5
41
40.5
40
RED: Co-Channel Service
39.5
BLUE: Adj-Channel Service
Black: Co-Channel Interference
39
-77
-76
-75
-74
-73
-72
Black: Co-Channel Interference, Red: Co-Channel Service, Blue: Adj-Channel Service
NPSTC: The Collective Voice of Public Safety Telecommunications
Possible
Out-of-Pool
Request
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Example – Pool Assignments
Block 52
NYC (NY), New Haven (CT), Burlington (NJ), Berks (PA)
Co- and Adjacent-Channel Case, Channel Block 52
41.5
Latitude
41
40.5
40
Co-Channel Blocks
39.5
50-km
-76
-75
-74
-73
-72
-71
Black: Co-Channel Interference, Red: Co-Channel Service, Blue: Adj-Channel Service
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Example – Pool Assignments
Block 52: NYC Applicant
NYC (NY), New Haven (CT), Burlington (NJ), Berks (PA)
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Example – Pool Assignments
Block 52
NYC (NY) – INTERFERER
New Haven (CT): 5.67% Area Loss at 90% Reliability
Burlington (NJ): 8.12% Area Loss at 90% Reliability
Berks (PA): 0.00% Area Loss at 90% Reliability
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National Public Safety Telecommunications Council
Q&A and Feedback
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Q&A and Feedback
• This is a lot to pack into 75-minutes
• I will be happy to go these concepts this
again at area RPC meetings
– Usually attend Region 8, 30, 55 meetings
– Often attend Region 19 and 28 meetings as
well
• Any Questions?
• Any Feedback?
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Contact for Further Information
Sean O’Hara
Business Area Manager – Analysis, Communications, and Collection Systems
Syracuse Research Corporation
[email protected]
315.452.8152 office, 315.559.5632 mobile
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