Modelling of SFN in Atoll.pdf

Modelling SFN in Atoll Atoll 3.4.0

SFN (Single Frequency Network) SFN is a network where several transmitters simultaneously send the same signal over the same frequency band.

Super Cell works in the same way as SFN

How to activate SFN modelling in Atoll In Atoll.ini (located in the same directly of Atoll.exe), add the 2 lines [Calculations] SignalCombining = 1 * Restart of Atoll application is required after modifying the Atoll.ini file.

Add the following custom field to the Transmitters table:

Defining Transmitter Clusters Enter in the TX_CLUSTER field the name of the transmitter which is the coordinator for all the transmitters of the same cluster.

Defining the Cell Power accordingly if power splitter is used at the RU level Transmitters table in Atoll

Example:

Define the name of coordinator transmitter

Cells table in Atoll

Define the split cell power

All the cells in the same cluster use same frequency and PCI

Calculating Coverage Predictions Using Transmitter Clustering Once the transmitter cluster is defined, you can calculate the LTE coverage predictions taking into account the defined cluster for signal combination

RSRP Coverage with and without cluster

RSRP coverage without Clustering

RSRP coverage with Clustering ➔ SFN = Super Cell configuration

Signals from different RRHs are combined

Best Server Plot with and without Cluster

Best Server coverage without Clustering Individual server identification of each RRH

Best Server coverage with Clustering ➔ SFN = Super Cell configuration

Best server is the coordinated transmitter

PDSCH SINR Coverage with and without Cluster

PDSCH SINR coverage without Clustering Severe interference due to co-channel and co-PCI configuration

PDSCH SINR coverage with Clustering ➔ SFN = Super Cell configuration

No interference between RRHs because they are logically belong to the same cell

Throughput Coverage with and without Cluster

DL Peak RLC channel th roughput coverage without Clustering Low throughput due to the poor SINR

DL Peak RLC channel throughput coverage with Clustering ➔ SFN = Super Cell configuration

High throughput thanks to the good SINR

Thank you