How SeNB decides it has to go for Inter-RAT HO after receiving measurement report from UE?

Question

How to inform MME about UE movement from Source eNB to Target eNB after UE sending Re-establishment with HO failure to target eNB during handover. In this case HO notify or path switch is applicable ?

Answer 1

1st thing is that to get measurement report eNB has to configure, so it means that eNB configured the measurement configuration

To configure for getting inter RAT frequency measurement eNb need to configure following thing in measConfig in rrc reconfiguration,

1> Measurement object ---- measObjectToAddModList : Add Frequency related to Inter RAT(utra, gsm, cdma) using this structure
measObjectUTRA MeasObjectUTRA,
measObjectGERAN MeasObjectGERAN,
measObjectCDMA2000 MeasObjectCDMA2000,

2> Report config- You need to configure reportConfigInterRAT ReportConfigInterRAT to tell UE that i need report based on these INTER RAT event.

3> Measurement id - Based on meas object and report config ....

So when eNB received report based on meas id eNb can know i had configured this meas for INTER-RAt frequencies ... if measurement result is good then go for INTER-RAT ho ...

Hope it will help you.

Comments

I think , Gnanendra concern is when eNodeB decides to trigger INTER-RAT HO for an UE. One of the use case might be "when UE is moving out from the LTE coverage" .