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How we use Hysteresis and offset at the time of triggering events and explain with example?

+3 votes

I have seen the related question but it lacks example, please reply in context of LTE.


posted Apr 16, 2015 by Gnanendra Reddy

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1 Answer

+1 vote

Lets first understand the hysteresis in the LTE -

Hysteresis: There can be a delay between action and reaction of a measurement and handover takes place. So there is a small error included in the measurement reporting to minimise the effect of the delay. In short measured neighbor look worse than measured to make sure it is really stronger before the UE decides to send a measurement report to initiate a handover.

Check the following

Offset: Each UE evaluates the Event A3 condition every time a new averaged measurement sample is available. The evaluated condition is the entering condition of Event A3: whether the RSRP measured from a neighbouring cell becomes an offset better than the RSRP measured from the serving cell.

Now lets see the A3 Event
Event A3 is triggered when a neighbouring cell becomes better than the serving cell by an offset. The offset can be either positive or negative. The event is triggered when the following condition is true:

MEAS(neigh) + O(neigh,freq) + O(neigh,cell) - Hyst > MEAS(serv) + O(serv,freq) + O(serv,cell) + Offset 
MEAS(neigh) + O(neigh,freq) + O(neigh,cell) + Hyst < MEAS(serv) + O(serv,freq) + O(serv,cell) + Offset
answer Apr 17, 2015 by Salil Agrawal
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+6 votes

While going through measurement events we will find two tern offset and Hysteresis , offset is quite clear as it is kind of ∇X in terms of strength of signal but can any one elaborate points on Hysteresis ?

+3 votes

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