hi rf9,
what is a tsl ?
1 TBF = 1 transfer for one user. Usually each user gets 1 DL TBF and 1 UL TBF : the DL TBF to receive the downloaded data, the UL TBF to send the TCP ack or application ack.
So the most relevant throughput KPI is the throughput per DL TBF.
cheers
pix