SRSRAN eMBMS throughput limit?

[rwsackman]

Hello,

I am running SRSRAN version 19.9.0 in EMANE, running on Ubuntu 18.04. I followed the
instructions in the user manual section 5.12 “eMBMS End-to-end” and (with a few modifications)
was able to get it working. Testing with iperf or MGEN, I am finding that the multicast throughput
is limited to 6Mbps, with an additional 6Mbps of throughput allowed for unicast. If I
attempt to increase throughput by increasing the enb.conf/p_nrb parameter above
25 (e.g. to 50 or 100), the receiving srsue interface crashes as soon as it receives the
first packet.

Using the following calculator with SRSRAN MCS=26.5 (256QAM), n_prb=25, and 1X1 SiSo, I am
expecting a total of 24.48Mbps downlink bandwidth, out of which I assume multicast would
consume some carve out without reducing the total cell bandwidth. However, the cell maxes
out at 6Mbps multicast + 6Mbps unicast.
https://www.cellmapper.net/4G-speed

Is this the expected throughput performance? Am I missing a step to achieve the calculated
throughput for the cell? I have attached the ENB and UE config files.

Thank you,
Ron
enb-conf.docx
ue-conf.docx