hello,
i can’t answe about the first question.
for the second question: tch congestion is counte based on the number of tch requests “rejected”, becaue the cell has all its tch channels busy. Whether it is HR or FR doesn’t change anything. Depending on the system capabilities, you can also have additional 2 indicators, that tells you the number of TCH HR congestion rate and TCH FR congestion rate.
regards,
pix