Quesion about Management And Storage Of ECMs By The Host

[sichunqin]

When the host collects a new ECM, it replaces the current section by the ECM_counter_index to log it in the recording and in parallel sends a ca_pvr_ecm_cmd to the CICAM
The above is copied from Chapter 15.2.3 in CI Plus spec 1.2. What is the new ECM? Is it re-encoded ECM returend in ca_pvr_ecm_cmd_reply? If yes, why send ca_pvr_ecm_cmd to the CICAM again?
If it is the original ECM, according to CI Plus spec, it shall relaces the current section. What is the current section?

Really confused . Looking forward to feedbacks.