ITU Kaleidoscope 2011
The fully networked human?
Innovations for future networks and services
Coexistence of a TETRA system
with a Terrestrial DTV system in
White Spaces
Heejoong Kim
Graduate School of Media Design,
Keio University
heejoong@kmd.keio.ac.jp
Cape Town, South Africa
12–14 December 2011
Research Object & Direction
 Why
was TETRA system considered
to DTV White Space applications?
Can be applied to Small idle space in DTV
Band, i.e. 25kHz channel BW @ Release I
 Usually used to public purpose such as PPDR

 What

is the direction of research?
Investigate the possibility of coexistence of
TETRA system with DTV in terms of
interference according to the operating powers
and frequency offsets
Cape Town, South Africa, 12-14 December 2011
ITU Kaleidoscope 2011 – The fully networked human? Innovations for future networks and services
Interference Scenario


TETRA BSs: Centered in hexagonal shaped cells
TETRA MSs: Uniformly randomly distributed
over their cell areas
J
I   j d
j 1

j
I  ITMO  I DMO
DMO
TMO
DTV
DTV cell
TETRA cell
Cape Town, South Africa, 12-14 December 2011
ITU Kaleidoscope 2011 – The fully networked human? Innovations for future networks and services
Simulation Results
Interference Power from TETRA BS (TMO)
CDF of TETRA DMO Interference Power
-70
1
Probability [ Interference Power < Abscissa ]
Interference Power [dBm]
BS Power Class = 1, 2, … , 10
-90
-100
-110
-120
Maximum Allowable
Interference Power
-130
-140
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Distance between a DTV receiver and TETRA BS [km]
Frequency Offset = 25 kHz
0.9
Frequency Offset = 25 kHz
-80
0.8
0.7
0.5
0.4
0.3
Maximum Allowable
Interference Power
0.2
0.1
0
-150
2
MS Power Class = 1, 1L, … , 4L
0.6
-140
Interference Power from TETRA BS (TMO)
-80
-70
-60
1
0.9
Probability [ Interference Power < Abscissa ]
Frequency Offset = 50 kHz
-90
Interference Power [dBm]
-120
-110
-100
-90
Interference Power [dBm]
CDF of TETRA DMO Interference Power
-80
-100
-110
-120
-130
Maximum Allowable
Interference Power
-140
BS Power Class = 1, 2, … , 10
-150
-130
0

0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Distance between a DTV receiver and TETRA BS [km]
Interference Power(BSs)
0.7

MS Power Class = 1, 1L, … , 4L
0.6
0.5
0.4
0.3
Maximum Allowable
Interference Power
0.2
0.1
0
-160
2
Frequency Offset = 50 kHz
0.8
-150
-140
-130
-120
-110
-100
Interference Power [dBm]
-90
-80
-70
CDF of Interference Power(MSs)
Cape Town, South Africa, 12-14 December 2011
ITU Kaleidoscope 2011 – The fully networked human? Innovations for future networks and services