1. SEAMCAT modeling system-level EMC Analysis
Stella Lyubchenko, ECO
EMC Europe 2014, September 1 - 4, Gothenburg, Sweden

2. SEAMCAT - Spectrum Engineering Advanced Monte Carlo Analysis Tool
What is SEAMCAT
SEAMCAT - Spectrum Engineering Advanced Monte Carlo Analysis Tool
SEAMCAT developed in CEPT as a co-operation project between National Regulatory Authorities (NRAs), industry and ECO
SEAMCAT is an important spectrum engineering tool for CEPT in assisting and reaching regulatory decisions.
EMC Europe Stella Lyubchenko/ECO

3. ECO/STG in Brief?
ECO: European Communications Office, the permanent office of the CEPT (Copenhagen, Denmark).
ECO is responsible for SEAMCAT in terms of funding, management and code implementation.
STG: SEAMCAT Technical Group, responsible for the continuous process of developing and optimising SEAMCAT.
EMC Europe Stella Lyubchenko/ECO

4. Cellular network overview and network layout
3GPP and 3GPP2 types grid are used in
SEAMCAT (figure represents 3GPP layout)
UEs are deployed randomly in the whole network region according to a uniform geographical distribution.
The wrap around technique is employed to take account for network deployment edge effects
Reference cell selection
EMC Europe Stella Lyubchenko/ECO

5. Reference Cell The ref. cell is used to measure results
All none reference cells are used to provide a proper interference background to the ref. cell
Reference Cell

6. OFDMA outline EMC Europe 2014 Stella Lyubchenko/ECO ID Description 1
Plot configuration – determines what is shown in the main plot area. 2
Legend – can be toggled from the plot configuration 3
Main plot area – provides visual information on the displayed OFDMA network. 4
Tips – can be toggled from the plot configuration 5
Summary of the last snapshot – provides a few metrics on the capacity of the shown system. If more than one cellular network is present in the scenario, this is how to switch between them. Only one cellular network can be inspected at a time 6
Details of the selected element – provides technical characteristic (frequency, Tx power, etc.) of the selected element.
EMC Europe Stella Lyubchenko/ECO

7. Cellular system last event
legend
BS antenna
BS or UE info display
General system info:
Cell specific info
Connected - voice active user
Active link
Inactive link
Dropped user
OFDMA interferer
Jukka Rakkolainen/ERO

8. Frequency UL

9. Adjacent cell interference
OFDMA DL SINR
Adjacent cell interference

10. OFDMA UL SINR
In UL each LTE user will be transmitting its own RB. It is assumed that each UE transmits the same amount of RBs therefore they have the same spectrum emission mask.
OFDMA UL = victim system. The interferer will impair each of the signals transmitted by the UEs serving its own BS (i.e. the victim BS). Therefore, for a specific link (UE1 to BS1) the interference caused by an external interferer will only affect the spectrum occupied by the RBs allocated to UE1 for that link and not the whole system bandwidth at BS1.

11. LTE Link-to-system level mapping
A look up table is used to map throughput in terms of spectral efficiency (bps per Hz) with respect to calculated SINR (= C/(I+N)) (dB) level.
This link level data (bitrate mapping) is user selectable and can be modified depending on the simulation to perform.

12. OFDMA results Capacity results +
Non interfered bitrate: bitrate before any external interference
interfered bitrate: bitrate after external interference is applied.

13. ECC Report 150: Compatibility studies between RDSS and other services in the band 2483.5-2500 MHz
ECC Report 150 considered the extension of the radiodetermination-satellite service RDSS (s-E) allocation in the band MHz for the purpose of global primary allocation (AI 1.18 WRC-12) .
Sharing studies in the band MHz were performed with fixed, mobile, mobile satellite and radiolocation services as well as with IMT systems identified in the adjacent band MHz and WLAN systems in the adjacent band MHz.
IMT studies were performed with the SEAMCAT UMTS and LTE module.
EMC Europe Stella Lyubchenko/ECO

14. RDSS vs IMT systems in the adjacent band 2500-2690 MHz and the impact of IMT UE on RDSS receivers
In the considered scenario the RDSS receivers (VLR) (yellow diamant) were randomly located at 1.3 km from its satellite transmitter (blue spot). The interference probability was determined depending on the modulation type of the RDSS receiver and the LTE deployment scenario:
EMC Europe Stella Lyubchenko/ECO

15. Compatibility with UMTS system
Effect of IMT systems to RDSS receivers was studied with SEAMCAT.
Results in the case of UMTS system:
Free space propagation and Extended-Hata models (rural, suburban and urban) were considered. Compatibility studies have shown that there is no impact on any type of RNSS receiver from UMTS UE.
EMC Europe Stella Lyubchenko/ECO

16. Compatibility with LTE system
Compatibility studies have shown that impact from LTE UE (10 MHz, 20 MHz) on any type of RNSS receiver is as follows:
Calculated probability of interference for RDSS receiver modulation format BPSK(4) and BPSK(8) in the case of LTE (10 MHz) network is varying from 3.4 to 5.4% which almost satisfies the interference criterion which should be met in 95% locations for mobile receivers;
Calculated probability of interference for RDSS receiver modulation format BPSK(1) and BOC(1,1) in the case of LTE (10 MHz) network is varying from 5.8 to 12.2%, thus more interference than the protection criteria of 5 %;
Calculated probability of interference in the case of LTE (20 MHz) network is varying from 1.4 to 3.6% which satisfies the interference criterion which should be met in 95% locations for mobile receivers.
EMC Europe Stella Lyubchenko/ECO

17. ECC Report 202: Out-of-Band emission limits for MFCN SDL operating in the 1452-1492 MHz band
ECC Report 202 was developed in order to provide technical background for harmonisation of the band MHz band for Supplemental Downlink Mobile/Fixed Communications Network (MFCN SDL).
The following scenarios were considered: MFCN SDL in MHz vs. Fixed, Mobile and Aeronautical Telemetry below 1452 MHz and above 1492 MHz.
Focus of the study is compatibility between MFSN SDL and uncoordinated fixed links (FL).
A post processing plug-in was created in order to reproduce the behaviour of the FL victim system which is able to avoid pointing its main beam into the direction of maximum antenna gain of the MFCN SDL BS.
EMC Europe Stella Lyubchenko/ECO

18. Scenario outline
The FS uses a 1.2 m dish antenna with a mesh reflector. This antenna type has a lower forward-back ratio therefore, the maximum gain was reduced by 2.7 dBi.
An MFCN SDL system/network was assumed as a system that will be deployed in a large area. The system description of the MFCN SDL system assumes a cell radius of 8.66 km (assumed maximum separation distance). The minimum separation distance is assumed as 250 m.
It is assumed that the operator of the FS is able to ensure that main beam is not pointed to the antenna of the MFCN SDL BS.
EMC Europe Stella Lyubchenko/ECO

19. SEAMCAT results
SEAMCAT analysis results for specific MFCN SDL BS for deployment of uncoordinated FL are presented in terms of EIRP limits:
EMC Europe Stella Lyubchenko/ECO

20. MCL results
Max MFCN SDL OoB e.i.r.p. = FL Receiver noise level + FL Target Interference to Noise Ratio - 3 dB - FL Antenna Gain + Pathloss (Free Space, 100 m);
Max MFCN SDL in-band e.i.r.p. = FL Receiver noise level + FL Target Interference to Noise Ratio + Blocking Response – 3 dB + FL Antenna Gain – Pathloss (Free Space, 100 m)
MCL results for MFCN SDL BS in band/OoB e.i.r.p. limits
EMC Europe Stella Lyubchenko/ECO

21. Useful examples
SEAMCAT gives the opportunity to investigate the influence of changing the radiated power of the ILT (Calculation Mode: Translation activated).
For this case the transmitted power is changed in a range and in a granularity given by the user.
EMC Europe Stella Lyubchenko/ECO

22. More information on SEAMCAT
More information at and-services/seamcat-spectrum-engineering- advanced-monte-carlo-analysis-tool and for the development.
On-line manual at
Software freely available at
Java Source code freely available upon request
EMC Europe Stella Lyubchenko/ECO

23. THANKS FOR YOUR ATTENTION

24. SEAMCAT use in and outside CEPT
Source: google analytics on the download page in 2013.
2013 survey on the number of SEAMCAT download: about 1200 download
EMC Europe Stella Lyubchenko/ECO