Current 5G market of Huawei almost come from China.
Yes, I hear Huawei deployed over 600k gNodeBs in China alone.
Sorry… Rakuten is using FlexRAN on FH interface not 7.2x.
Why are you saying Open RAN?
FlexRAN is a INTEL FH interface.
As per my knowledge rakuten having CU, DU with Altiostar and RU with Nokia.
Please correct me if I am wrong…
You are right, but it is flexRAN fronthaul not pure 7.2x.
Agree buddy 
From Altiostar DU to RIU (Radio Interface Unit) on the pole you have FlexRAN, from RIU to Nokia RRH you have CPRI.
RIU is converter used for cpri to ecpri… is it correct?
Yes, correct.