What is the maximum number of UEs allowed per TTI on a 100 MHz sub-6 band?

Hello everyone!

What is the maximum number of UEs allowed per TTI on a 100 MHz sub-6 band?

For example, in an Ericsson system?

There is no upper limit as per 3gpp.
We can allocate min. 1 PRB to 1 UE.
Therefore we can have 273 UEs frequency multiplexed in 273 PRBs (100MHz, 30kHz SCS)
On top of that we can have MU-MIMO as well.

But the limit on No. Of UEs per TTI limit comes from PDCCH bottleneck.
There are only 45 CCEs in 1 OFDM symbol for DCIs. That means 45 DCIs with Aggregation level 1.
For 3 OFDM symbols you can have 135 DCIs max in best case.