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LTE : Has anyone tested Circuit Switch Fallback (CSFB) in the lab or in the field ?

+1 vote
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I want to know what happens in the network w.r.t signalling call flow as well as user experience ?

posted Oct 16, 2015 by Harshita

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1 Answer

+1 vote

Yes, I have tested both in lab and field.

In terms of signalling,

UE sends extended service request message with cause as MO/MT CSFB indicator call

UE is redirected to UTRAN and it attaches to 3G and establishes call there.

For user, its almost seamless and normal user won't know it switched to 3G. There is hardly any lag observed if you compare to normal 3G call

answer Oct 22, 2015 by Alkesh Mehta
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