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Triggering handover
Posted on 17. Aug, 2013 by Mohammedkasri
in LteWorld Forum
Which parameter used by eNB to decide X2i handover depending on Event A2 measurement ? timeToTrigger or reportAmount or others ?
I want to know how the eNB decide to trigger handover based on Event A2 measurement report.
Event A2 not for handover
Event A2 is not a likely candidate used to decide handover. On the other hand, it could be used to trigger configuration of different measurement values for Even A3/A5 or configure Event A3/A5 (if not already configured).
Also, why does ENB constraint itself with only A2?
Event A2 not for handover
Given below are the description of the events used to trigger the intra LTEi handover.
A1/A2 are only used to indicate to the network if the UEi is receiving decent power levels or not. They cannot be used to trigger a handover. They do not monitor the power levels of the neighbour cells.
A1 -> Serving becomes better than threshold
A2 -> Serving becomes worse than threshold
A3 -> Neighbour becomes offset better than serving
A4 -> Neighbour becomes better than threshold
A5 -> Neighbour becomes better than threshold and serving becomes worse than
threshold.
A2 triggering A3/A4/A5 Configuration may be to focus only on the UE whose power levels are deteriorating. As these are event based measurements, network would want to use up the battery life of the UE by unwantedly telling it to monitor for the event conditions of A3/A4/A5 even though they are receiving good power levels.
Hope i have answered your question.
I did not get your complete question "Also, why does ENB constraint itself with only A2?" . Can you please elaborate. I will try to answer the same.