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Why do we setup multiple A events for a call? Setup for A2 Event, Why?

+1 vote
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Why do we setup multiple A events for a call? Setup for A2 Event, Why?
posted Aug 14, 2016 by Mike Chanicka

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1 Answer

+1 vote

Event A1 and A2 are configured to measure the serving cell and sends the measurement report to eNodeB so that eNodeB take the defined actions. Event A1 is reported when UE measures that serving cell is better than the configured threshold. After receiving this event, eNodeB come to know that current serving cell is better for UE. Event A2 is triggered from UE to eNodeB when the current serving cell measurement goes down than the configured threshold. After receiving event A2, eNodeB can configure UE for reporting other events such as A3, A4, A5 to get the measurement of neighbor cells. Further, eNodeB initiates handover procedure based on the received event (A3/A4/A5).

answer Aug 15, 2016 by Harshita
Adding few more lines on top of the answer given above.
Event A2: When serving cell becomes worse than configured threshold value.

Entering condition for the event A2:
Ms + Hys < Threshold

Leaving condition for the event A2
Ms - Hys > Threshold
Similar Questions
+1 vote

Hi Folks,

Can you explain me when we will prefer A2 and A3 events for measurement report?
And is there any relation between the events?
What are these Ms,Hys,Thresh,Ofn,Ocn,Mn and how ENb will set these values in the meas config?

Thanks ,

Naveen.

+3 votes

I came to know when an UE attach to network, it is configured for events A1 and A2 by default as part of normal attach. Is it correct ? if yes then why ?

+2 votes

I was going through the measurement configuration sends from eNodeB to UE in RRC Connection Reconfiguration message.
I saw that multiple events have been defined and are used. Couple of parameters are considered to detect entering and leaving condition of an event for example event A1. Now I have a question "Threshold and Hys values are same for all the cell or it may different". Does the standard define the value of all these parameters or network operator defines ? If network operator does then what are points to derive these values ?

+3 votes

If I am wrong, please specify which event is important?

+2 votes

is there any specific events in LTE that support only interfrequency and intrafrequency HO ... kindly specify in detail how

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