Throughtput issues due to transmission in LTE

Is there any Ericsson counter to indicate throughtput issues due to transmission issues in LTE?

You can check SCTP packet loss, but again those are not quite relevant, if co site has 3G with same (TX path).
Then you can co relate it with pmcapallociubhslimitingratio for SPIs through which ur max traffic flows. Further if its site specific then you can check ping delay.

SCTP is just between enb and MME for signaling. Throughput is user plane between enb and sgw, protocol is TCP. So sctp packet loss is not transmission issue related to throughput.