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What the actual difference of A4 and A5 events in the LTE Handover ?

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What the actual difference of A4 and A5 events in the LTE Handover ?
posted May 12, 2015 by anonymous

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1 Answer

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Event A4

The LTE Event A4 is triggered when a neighbouring cell becomes better than a threshold.

MEAS(neigh) + O(neigh,freq) + O(neigh,cell) - Hyst > Threshold 

Triggering of the event is subsequently cancelled when the following condition is true:

MEAS(neigh) + O(neigh,freq) + O(neigh,cell) + Hyst <Threshold

Event A5

LTE Event A5 is triggered when the serving cell becomes worse than threshold-1 while a neighboring cell becomes better than threshold-2. The event is triggered when both of the following conditions are true:

MEAS(serv) + Hyst < Threshold-1 
MEAS(neigh) + O(neigh,freq) + O(neigh,cell) - Hyst >Threshold-2

Triggering of the event is subsequently cancelled when either of the following conditions are true:

MEAS(serv) - Hyst > Threshold-1     
MEAS(neigh) + O(neigh,freq) + O(neigh,cell) + Hyst <Threshold-2
answer May 12, 2015 by Salil Agrawal
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