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LTE functions in ICS telecom
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LTE FUNCTIONS IN ICS telecom
LTE functions in ICS telecom
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Table of Content
1. E-NODEB STATION PARAMETERS................................................................................... 3
2. LTE FUNCTIONS IN ICS TELECOM .................................................................................... 4
2.1 LTE/RSPRP COVERAGE ANALYSIS .................................................................................. 4
2.2 LTE/HANDOVER.................................................................................................................... 5
2.3 LTE/SNIR MAPS….................................................................................................................. 7
2.4 LTE/SNIR TRAFFIC MAPS (PUSCH)................................................................................. 9
2.5 LTE/PARENTING .................................................................................................................11
2.6 COVERAGE/NETWORK INTERFERENCE/DIGITAL SFN (COFDM)…....................13
LTE functions in ICS telecom
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1. E-nodeB station parameters
The user has to select the "LTE" signal type, once the LTE signal is selected the user can define the specific
following parameters:
- the Tx/Rx bandwidth of the e-nodeB (the bandwidth according to the number of resource blocks
used):
When the bandwidth is selected the "Total number of resource blocks", the "Total number of Sub- carriers"
and the "Subcarrier Spacing" are automatically updated in the "Channels" tab according to the 3GPP tables:
- Parameters in the "e-nodeB" tab : The user will define here the traffic parameters of the station such
as the "% Ref Signal" (which represents the percentage of power dedicated to the reference signal
channel or the "pilot channel") and the "%PDSCH" which represents the percentage of power
LTE functions in ICS telecom
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dedicated to the traffic channels). Note that the rest of the percentage power is dedicated to the
other common channels (paging, synchronization, …).
"DL Kbit/s" and "UL kbits/s" are used to define the capacity of the station.
2. LTE functions in ICS telecom
2.1 LTE/RSPRP coverage analysis
The functions available in this menu are listed below.
- LTE/RSRP coverage analysis /Composite coverage : This function computes the composite coverage
of the RSRP (Reference Signal Received Power) based on the "% Ref Signal" defined in the parameters
of the e-nodeB station.
- LTE/RSRP coverage analysis /Best Server coverage (16 b) : This function computes a best server map
of the Reference Signal (RS).
- LTE/RSRP coverage analysis /Overlapping: This function computes the overlapping areas of the RS
transmitted by the whole LTE network in the project.
- LTE/RSRP coverage analysis /Simultaneous : This function computes the percentage of the RS
simultaneously received transmitted from the whole LTE network in the project. For example, if for a
given pixel the result is equal to 30% it means that the receiver will be able to received a RS signal
from 30% of the stations available in the project.
LTE functions in ICS telecom
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2.2 LTE/Handover
- LTE/Handover /Neighbour… : This function is populating the neighbour list of each activated e-nodeB.
This function includes the handover intra-system (LTE<->LTE) and inter-system
(LTE<->WiMAX or LTE<->UMTS or LTE<->GSM).
o "Default handover margin (255= from station parameters) (dB)" is the HO margin used between
LTE stations.
o "Handover margin LTE<->UMTS (255= from station parameters) (dB)" is the HO margin used
between LTE stations and UMTS stations.
o etc…
Note that a station is considered as "LTE" if the signal type of the station is "LTE" (idem for WiMAX, UMTS and
GSM)… Once the calculation is done the neighbor list is automatically updated in the "e-nodeB setup" tab of
each station:
LTE functions in ICS telecom
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- LTE/Handover /Neighbour report… : This function generates the neighbour report resulting from
the neighbor list established for each e-nodeB.
- LTE/Handover /Handover map… : This function allows draws a Handover map (intra and inter
system):
o Handover map option: This option computes all possible combinations of handover for each
activated LTE station according to the neighbor list attached to each e-nodeB.
o Soft Handover option : This option draws the soft handover map of a given LTE station
(Station ref. #). The handover areas are computed according to the neighbor list attached to
the reference e-nodeB.
o Hard Handover option: This option draws the hard handover map of a given LTE station
(Station ref. #). The handover areas are computed according to the neighbor list attached to
the reference e-nodeB.
LTE functions in ICS telecom
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2.3 LTE/SNIR Maps…
- SNIR (PDSCH) : This option draws a SNIR map dedicated to the PDSCH (DL) traffic channel.
SNIR (PDSCH) (dB) = C (dBm)/RSSI (dBm), with :
"C (dBm)" : The power received for the wanted PDSCH traffic channel in DL.
"RSSI (dBm)" or "Received Signal Strength Indicator": The total received power from all
sources, including co-channel serving and non-serving cells, adjacent channel interferences, thermal
noise... (3GPP TS 36.214 V8.2.0).
This option can be used in ICS telecom to display the map of traffic as shown below :
LTE functions in ICS telecom
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Example of traffic map in LTE
(Please note that the CQI/Throughput table defined in the user palette in this example is
not based on vendor or 3GPP standards but is only to illustrate a traffic map)
- "RSRQ": This option draws a RSRQ map (dB) (Reference Signal Received Quality) defined as the ration
between the best RSRP and the RSSI. The function displays a SNIR map of the pilot channel.
LTE functions in ICS telecom
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2.4 LTE/SNIR traffic Maps (PUSCH)
- Global noise rise method : This option computes an SNIR map dedicated to the PUSCH traffic channel (UL) via
a noise rise factor (dB). With this method the user has to define the Noise Rise (dB) from which the SNIR
dedicated to the PUSCH channel will be computed on each pixel.
- Subscriber distribution method (Monte Carlo) : With this method, the generation of subscribers on the
service area is a mandatory. Once the parenting is done, a map of SNIR based on the PUSCH signal transmitted
by the subscribers can be calculated via a distribution method based on Monte Carlo method. The user can
specify the number of pass(es) used in the process.
Note that the nominal power defined in the subscriber parameter box is considered as the power of the PUSCH
channel (UL traffic channel).
LTE functions in ICS telecom
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SNIR traffic Map (PUSCH) in ICS telecom
LTE functions in ICS telecom
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2.5 LTE/Parenting
This function connects the LTE subscribers to the stations according to the following default rules :
- In downlink : * the RS received power must be greater than the predefined threshold (as defined in the
“Threshold (dBuV/m)” parameter of the subscriber parameter box);
* the SNR must be greater than the predefined minimum C/N+I required (as defined in the
“req C/N+I” parameter of the e-nodeB setup tab);
* the DL capacity of the station can afford the subscriber's demand.
- In uplink : * the received power must be greater than the threshold defined in the e-nodeB station (as
defined in the “Rx threshold (dBuV/m)” parameter f the e-nodeB setup tab);
* the UL capacity of the station can afford the subscriber's demand.
Two methods can be used : connection according to the best server or the nearest server received.
At the end of the calculation a report is automatically generated. This report gives the repartition of
connections on each station.
LTE functions in ICS telecom
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- Options:
o “Connect orphan only”: If this option is checked, the parenting will be compute just for the
“orphan” subscribers (subscribers not yet connected).
o “Do not connect if subscriber outside BS sector (start/end): This option This option allows you to
accept parenting if the subscriber is in the area of the e-nodeB defined by “Sector start°” and
“Sector end°” (e-node B parameter box).
o Adaptive modulation: This option allows to offer the maximum bit rate according to the best
modulation and the RS signal level received. If this option is checked, the subscriber traffic factor
will be set according to the DL SNR, the UL received field strength level associated to the
modulation.
Parameters of the adaptive modulation:
Delta (dB)/ req.C/N+I (DL), delta (dB) /threshold, traffic factor and the modulation associated.
o Fixed modulation: This option allows to offer the maximum bit rate according to the best
modulation and the RS signal level received. If this option is checked, the subscriber traffic factor
will be set according to the DL SNR, the UL received field strength level associated to the
modulation.
LTE functions in ICS telecom
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2.6 Coverage/Network interference/Digital SFN (COFDM)…
In case of SFN LTE networks, this generic feature can be used, with specific parameters. The guard interval (µs)
and the unable symbol (µs) dedicated to the MBSFN network (with short Cyclic Prefix or Long Cyclic Prefix) are
integrated in standard predefined tables.
LTE functions in ICS telecom
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