OFDMA Module Usage within Seamcat
1
Summary
 Using generic or OFDMA model when
addressing compatibility/sharing
studies?
 Pointing out differences between both
models
 Being able to build common
configuration for both scenarios
2
Using Generic/OFDMA model
when addressing
compatibility/sharing studies
•
Subject: Impact of Mobile Service on another/the
same service within Seamcat
•
•
Specific OFDMA Module
Generic Module
Which module should be used and Why?
3
Using Generic/OFDMA model
when addressing
compatibility/sharing studies
•
An example:
•
Specific OFDMA Module was used for Interfering Links
Simulation of potential interference from LTE UL to DVB-T & determination of UE OOBE level
4
Using Generic/OFDMA model
when addressing
compatibility/sharing studies
•
An example:
•
What happens if we replace OFDMA Module by Generic?
Simulation of potential interference from LTE UL to DVB-T & determination of UE OOBE level
5
Using generic/OFDMA model when
addressing compatibility/sharing
studies?
6
Highlighting differences between
two modules
•
Where? Interfering Links
•
Specific OFDMA Module
Generic Module
7
Highlighting differences between
two modules
OFDMA Module case
General settings
Task 2: How can we calculate the Number
of mobile (User Equipment UE) per base
station (BS)?
Task 3: If UE uses 1 Resource Block (RB)
or all RBs, should we use the same
emission mask for it?
Task 4: Since only one emission mask (9
MHz) can be used, how many UEs/BS
should we simulate?
Task 5: According to Task 4, update value
of one parameter in OFDMA General
Settings.
8
Highlighting differences between
two modules
OFDMA Module case
OFDMA Uplink
Please don’t forget to update
some parameters in OFDMA
Module panel
OFDMA UL
Min Transmit power of MS
must be equal to
Max allowed transmit power of MS
(as there are no specific power control
in Generic Module)
Max allowed disconnection attempts=0
Power scaling Threshold=1
9
Highlighting differences between
two modules
OFDMA Module case
Positioning
Task 6: Regarding the Number of BSs in
the system and the Cell layout in the
System Panel, how many BSs per cell do
we have?
Task 7: From Tasks 5 & 6, how many UEs
per cell do we have in this scenario?
Transmitter to Victim Link
Receiver Path
Task 8: Which device from the Interfering
Links can be positionned related to one
victim device (Tx or Rx)?
10
Highlighting differences between
two modules
Transmitter to Victim
Link Receiver Path
Generic Module case
Task 9: Which device from the
interfering links (Rx or Tx) can be
positionned related to one victim
device (Tx or Rx)?
Task 10: Is that possible to tune
the Number of active transmitters
(UEs in this case)? Which Modes
do make this parameter active?
Task 11: We need also to simulate
distance(UE, Rxvictim). Which Mode
is the only one enabling such
tuning?
Task 12: Which Position relative to
should we define?
11
Is that possible to reach common
configuration for different scenarii?
Position Interferer/Victim
Module
BS/RxV
OFDMA
UE/RxV
Generic
Task 13: According to Tasks 8 and 9, which configurations could lead to common position
for both scenarii?
Task 14: Explain through the Minimum Coupling Loss (MCL) concept why BS and UE
cannot be set up at the same place. Conclude that if Rxvictim and BS can be located at the
same position, common setting is possible for both scenarii.
Task 15: Update position of Interferer UE for different modules in order to get the
common configuration
12
Is that possible to reach common
configuration for different scenarii?
Run the scenario with OFDMA Module
Look at the Simulation Outline.
Task 16: Do we see LTE UE position on the
graphic?
13
Is that possible to reach common
configuration for different scenarii?
Since LTE UE position /Rxvictim is unknown,
we need to find another way for deriving the
distribution of the Path distance factor in the
scenario with Generic Module.
•
Task 17: Save previous parameter settings
(from previous Tasks)
Run the simulation and compare
Unwanted/Blocking iRSSs from
OFDMA module to Generic one.
→ As results are still different, the distribution of the path
distance factor for the Scenario with Generic Module
needs to be updated!
14
Is that possible to reach common
configuration for different scenarii?
In order to assess the distribution of the LTE UE position over random events (in OFDMA
Module) so that we integrate it in the Generic Module, we could base on Effective Path
Loss (EPL) parameter of the Interfering/Victim link UE/Rxvictim.
Min EPL= Minimum Coupling Loss (MCL)
3GPP TR 36.942: An important parameter to be defined is the minimum coupling loss
(MCL). MCL is the parameter describing the minimum loss in signal between BS and UE or
UE and UE in the worst case and is defined as the minimum distance loss including antenna
gains measured between antenna connectors.
As MCL depends on GRx and GTx, if one of those gains is not constant, antenna
discrimination needs to be assessed at any event /derivable when
generating random data given that azimut random distribution, however we cannot access
azimut for each event.
15
Is that possible to reach common
configuration for different scenarii?
GTx is the gain of UE, assumed to be isotropic.
However, GRxvictim is not isotropic.
Task 18: Set GRxvictim to isotropic by unticking horizontal/vertical
pattern.
→ Assumption: isotropic antenna gain for Rxvictim.
From the Seamcat results, it is possible to derive Iarg so that P(Interference≤Iarg)=95%.
When GRx, GTx are constant, we manage to calculate darg=φ(Iarg) from the PathLoss.
16
Is that possible to reach common
configuration for different scenarii?
17
•Values of probability distribution of the path distance factor between UE in interfering link and Rx victim for the Generic Scenario: mean=0
Is that possible to reach common
configuration for different scenarii?
Probability distribution for
the Path Factor Distance
Values of μd=0.62
σd=0.23
We are able to assess
the distribution of the UEs
within the OFDMA
Module and to apply it
with the Generic Module.
18
•Values
We
finally
of get
probability
the results
distribution
for: OFDMA
of the
Module:
path distance factor between UE in interfering link and Rx victim for the and
Generic
also for
Scenario:
Generic
mean=0
Modu
Is that possible to reach common
configuration for different scenarii?
OFDMA Module
Generic Module
YES, that is that possible!!
19
Conclusions & Prospect
Both scenarii may lead to common results with suitable parameters setting.
Each Module has its own specificity, specific scenario may be run from only one Module
Looking at glance on Simulation Outline helps to check the relevance of the selected
scenario.
Future Improvements of Seamcat will help any user to ‘check’ some parameters for
debugging (e.g. being able to extract distance between 2 devices for each random event
from the Interference iRSS)
Future Improvements of Seamcat could work on enabling use of different Emission Masks
(when available in the Library) depending on the RBs amount allocated to each UE.
20