A25 Answers to the TETRA vs FM PMR example

Note: See the questions of this exercise in section ‎ANNEX 24:.

SEAMCAT parametrisation of simulation scenario TETRA versus FM.

1. SYSTEMS:

1.1 FM as Victim Link

Name: FM
Frequency: Constant 412.00625 MHz (channel spacing)

1.1.1 Transmitter: FM MS (VLT)

Transmitter Identification

Name: FM-MS

Antenna pointing

Antenna height: 1.5 m, constant
Antenna azimuth: 0...360 degrees, uniform
Antenna elevation: 0 degrees, constant (horizontal direction)

Antenna Pattern Identification

Description: Omni-directional
Maximum gain: 0 dBi

Emission Characteristics

Power: 37 dBm, constant

1.1.2 Receiver: FM BS (VLR)

Receiver Identification

Name: FM-BS

Antenna pointing

Antenna height: 30 m, constant
Antenna azimuth: 0...360 degrees, uniform
Antenna elevation: 0 degrees, constant (horizontal direction)

Antenna Pattern Identification

Description: Omni-directional
Maximum gain: 9 dBi

Reception Characteristics

Noise floor: -131 dBm, constant(=Sensitivity – C/I)
Blocking mode: Sensitivity
Blocking mask: -23 dB, constant
Intermodulation rejection: 0 dB, constant
Sensitivity: -110 dBm
Reception bandwidth: 8 kHz
Overloading: NO

Interfering Criteria

C/I: 21 dB (if only C/I, then C/(N+I) and (I+N)/N are not required)
C/(I+N): 21dB (C/(N+I) required only for selected Blocking-Mode)

1.1.3 Transmitter to Receiver path (VLT - > VLR)

Relative location

Correlation: None
Path azimuth VLR: Uniform distribution 0 to 360 degrees
Path distance factor: Uniform polar, 1*cell radius

Coverage radius

Cell radius mode: User-defined radius
Fixed radius: 7.8 km

Local environment:

Receiver: 100% outdoor
Transmitter: 100% outdoor

Propagation model

Model: Extended Hata
Variation: Yes
General environment: RURAL (results in lowest path attenuation)
Propagation environment: ABOVE ROOF (with a 30 m FM BS-Antenna height)

1.2 TETRA as Interfering Link

Name: TETRA
Frequency: 410.1875…411.9875 MHz, uniform

1.2.1. Transmitter: TETRA MS (ÍLT)

Transmitter Identification

Name: TETRA-MS

Antenna pointing

Antenna height: 1.5 m, constant
Antenna azimuth: 0...360 degrees, uniform
Antenna elevation: 0 degrees, constant (horizontal direction)

Antenna Pattern Identification

Description: Omni-directional
Maximum gain: 0 dBi

Emission Characteristics

Power: 30 dBm, constant
Emission Mask:

Unwanted mask: Offset in MHz, power in dBc referred to Reference bandwidth

-10.0000 -100.0000 18.0000

-0.5010 -100.0000 18.0000

-0.5000 -80.0000 18.0000

-0.2510 -80.0000 18.0000

-0.2500 -75.0000 18.0000

-0.1000 -75.0000 18.0000

-0.0750 -66.0000 18.0000

-0.0500 -66.0000 18.0000

-0.0250 -60.0000 18.0000

-0.0125 0.0000 18.0000

0.0125 0.0000 18.0000

0.0250 -60.0000 18.0000

0.0500 -66.0000 18.0000

0.0750 -66.0000 18.0000

0.1000 -75.0000 18.0000

0.2500 -75.0000 18.0000

0.2510 -80.0000 18.0000

0.5000 -80.0000 18.0000

0.5010 -100.0000 18.0000

10.0000 -100.0000 18.0000

Transmitting bandwidth: 18 kHz (Bandwidth < channel)
Reference bandwidth: 18 kHz
Unwanted emission floor: NO
Power control:
- Power Control step size: 5 dB
- Min Threshold: -86 dBm
- Dynamic Range: 15 dB

1.2.2 Receiver: TETRA BS (ILR)

Receiver Identification

Name: TETRA-BS

Antenna pointing

Antenna height: 30 m, constant
Antenna azimuth: 0...360 degrees, uniform
Antenna elevation: 0 degrees, constant (horizontal direction)

Antenna Pattern Identification

Description: Omni-directional
Maximum gain: 11 dBi

Reception Characteristics

Noise floor: -125 dBm, constant(=Sensitivity – C/I)
Blocking mode: User defined
Blocking mask: 0 dB, constant
Intermodulation rejection: 0 dB, constant
Sensitivity: -106 dBm
Reception bandwidth: 18 kHz
Overloading: NO

Interfering Criteria

C/I: 19 dB (if only C/I, then C/(N+I) and (I+N)/N are not required)
C/(I+N): 16 dB (C/(N+I) required only for selected Blocking-Mode)
(N+I)/N: 3 dB
I/N: 0 dB

1.2.3 Transmitter to Receiver path (ILT - > ILR)

Relative location

Correlation: None
Path azimuth VLR: Uniform distribution 0 to 360 degrees
Path distance factor: Uniform polar 1*cell radius

Coverage radius

Cell radius mode: Traffic limited network
Density: 5
Nr. of channels: 80
Nr. of users per channel: 1
Frequency cluster: 9

Local environment:

Receiver: 100% outdoor
Transmitter: 100% outdoor

Propagation model

Model: Extended Hata
Variation: Yes
General environment: RURAL(results in lowest path attenuation)
Propagation environment: ABOVE ROOF (with a 30 m TETRA BS-Antenna height)

2. SCENARIO

2.1. VICTIM SYTEM

Victim System: FM
Frequency: Constant, 412.00625

2.2. SIMULATION CONTROL

Number of events: 20 000

2.3. INTERFERING SYSTEM LINKS

Link1: TETRA
Frequency: 410.1875…411.9875 MHz, uniform

2.4 ILT -> VLR path

Relative positioning of the interfering link

Mode: Uniform density
Position relative to: Victim Link Receiver
Delta X: Constant, 0
Delta Y: Constant, 0
Set ILR at the centre of the distribution: NO
Path azimuth: Uniform distribution, 0 to 360 degrees
Number of active transmitters: 9
Minimum coupling loss: Constant, 0
Protection distance: Constant, 0

Interferers density

Density of Tx: 5 * 1/Km²
Probability of transmission: 1
Activity: Constant, 1
Time: 1 hour

Propagation Model

Model: Extended Hata
Variation: Yes
General environment: RURAL(results in lowest path attenuation)
Propagation environment: ABOVE ROOF (with a 30 m FM BS-Antenna height)

3 RESULTS

Test of the simulation

Calculated radius

Coverage radius (wanted system): 7.8 km
Coverage radius (interfering system 1): 0.7522 km
Simulation radius 1: 0.7569 km

Generated Signals

PC “on”

dRSS: mean: -69.9 dBm, std: 11.68 dB
iRSS_unwanted: mean: -127.5 dBm, std: 10.86 dB
iRSS_blocking: mean: -144.6 dBm, std: 7.13 dB

PC “off”

dRSS: mean: -69.8 dBm, std: 11.78 dB
iRSS_unwanted: mean: -112.6 dBm, std: 10.84 dB
iRSS_blocking: mean: -129.6 dBm, std: 7.19 dB

Interference calculation/ICE calculation

Interference Criteria: C/I
Compatibility mode: Yes (Probability of interference)
Unwanted emissions: Yes
Blocking: Yes

Results

PC “on”

Probability of interference: 1 %

PC “off”

Probability of interference: 8.4 %