nRF9160 eDRX cell handover?

[MBB]

I am evaluating the nRF9160 features - and the low average power while in eDRX is attractive if it reduces transaction times when establishing comms on the next eDRX wake up time. My question is - when the device is mobile and moves into another cell area while in eDRX sleep - does the new cell recognise the device as efficiently as it would have been recognised in the original cell area (i.e. can an efficient handover be done once device wakes from eDRX in a new area)

[Bjørn Kvaale]

Very sorry for the delayed response.  I asked a colleague & he replied: "I believe that the TAU (tracking area update) messages are used to determine when the UE moves between the eNBs. So if it moves to the neigbour eNB, it will not be much extra overhead. It will update the position upon the next eDRX interval. But if it moves across several base stations, I believe that it will take some more efforts to get it back online"

This blog post summarizes it quite well.