LTE: What does the need of sending measurement Identity while doing measurement configuration ?

Question

Need clarity on following items:
1. What is the use of "UE selected plmn" information for an eNodeB ?
2. Is the ECGI/TAI constructed based on the primary plmn (PLMN broadcasted in 0th index in SIB1 ) or based on the UE selected PLMN ?

Answer 1

As it gives a unique identification to each measurement.

Measurment-Object  Report-Config                          Measurment-Id
1 (Carrier freq 1)         1(A3)                                   1
1 (Carrier Freq 1)         2(A2)                                   2
2 (Carrier Freq 2)         1(A3)                                   3

See each time measurment ID should be different for each unique measurement u do.