What is the calculation method of passenger flow for each line?

You only need to divide the traffic of each line by the number of tch channels in one hour. For example, cell A has 1 carrier frequency, 8 channels, including 6 tchs, and this hour generates 3erl traffic, then the traffic of each line is 3/6=0.5, and generally it will be very busy if it is greater than 0.5.