1. IEEE 1900.5 Contribution Author’s Name Affiliation Address Phone email
John A. Stine
MITRE
McLean, VA
Document Title: Adding Spatial and Temporal Resolution to Models
Document Date: May 21, 2015
Document No: subs (assigned by document server
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2. Adding Spatial and Temporal Resolution to Models
John A. Stine
MITRE
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3. Issue
Spectrum consumption modeling encourages building models for a system for a single space and time period (i.e. a single space, a single time period, with a single propagation map and a single power map)
Many spectrum use scenarios demand differentiating use across multiple locations
What is the best way to differentiate location differences
A system model with a complete model for each location
A modeling hierarchy that consolidates location based constructs
Including multiples of the constructs in the same model and using indexes to associate constructs to each other
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4. Recommendation
Use location indexes to associate the constructs to each other
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5. Reasons to use multiple locations
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6. Locations are Non-Convex
Algorithms assume locations are convex
In reality, many locations are non-convex, e.g. census tracts
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7. Locations are Non-Convex - 2
Non-convex areas are subdivided into multiple convex areas
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8. Big Differences in the Environment
Using worst case environmental model may be too restrictive for a larger area.
High terrain with advantaged propagation
Low terrain shielded in some directions by terrain features
Rough terrain with no intention of building service
Illustration taken from a paper in correspondence written by Greg Billock of Google
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9. Use changes over time
Given a tactical plan, map out anticipated locations networks will be in an operation over time
OBJ Buick 1 D
(-) 2 3 B A
(+) 1 A
TAC
PAA
D/3 B
OBJ – Objective
CRO – Combat Replenishment Operations
PAA – Primary Artillery Area 1
(-)
CRO
10 KM

10. A reason to model changes over time
Multiple users with different space-time models allow algorithms to choose the assignment of channels to minimize or avoid interference
OBJ Buick 1 D
(-) 2 3 B A
(+) 1 A
TAC
PAA
D/3 B
OBJ – Objective
CRO – Combat Replenishment Operations
PAA – Primary Artillery Area 1
(-)
CRO

11. Modeling Options
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12. Modeling Option - 1
A single system model with a complete transmitter and a complete receiver model for each location
SystemModel
SystemID
Name
Purpose
Boundary
UberModel
TxModel ⁞
RxModel
Many models, most replicating the constructs of the others with differences in only a few constructs
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13. Modeling Option - 2
Consolidate construct elements associated with locations in a level of hierarchy
Currently
With Change
One LocationGroup for each location, some constructs are replicated
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14. Modeling Option - 3 Use location index as proposed
Every model has at least 1 of each of the location associated constructs
If any have an index, it is associated with others that have the same index
If one type of location associated constructs does not have an index that matches that of another type then associate the construct(s) without a location index
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16. Comparison
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17. Comparison Criteria Replication of data Modeling simplicity
Does the approach require messages and data structures to replicate the same constructs
Modeling simplicity
Can the modeler make a general model and then call out exceptions
Device association
Does the model clearly indicate that the locations associated constructs are of the same device
Reading Simplicity
Does the model make it easy for a human reader to associate the location associated constructs with each other
Programming Simplicity (database management and system assessment)
Easy to write programs to use the data correctly
Programming Simplicity (device assessment)
Easy to write programs that associate
Programming Simplicity (Tools for modeling)
Easy to write programs for tools that support modeling
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18. Comparison Option 1 Option 2 Options 3 Data Replication 3 2 1
Modeling Simplicity
Device Association
Reading Simplicity
Database and assessment
Device assessment
Tools
The relative value of these is debatable. Those that Option 3 does best are the ones that are the most important to me.
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19. Poll Which option do you prefer Option 1 Option 2 Option 3 12/10/2018
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