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LTE: Why does "Create Indirect Forwarding Tunnel procedure" optional ?

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LTE: Why does "Create Indirect Forwarding Tunnel procedure" optional ?
posted May 21, 2014 by Ganesh Kumar

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1 Answer

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I guess, "Indirect forwarding tunnels" are created by MME when at least one of AM mode bearer is created at target eNodeB. It is just created to achieve loss less handover. If you check the handover call flow, it is created only when target prepares the resource for a candidate UE.

If SGW is being changed as part of handover, MME may send "Created Indirect Data Forwarding Tunnel Request" to target SGW and MME receives response from target SGW.

Once the handover command message is sent out to UE, source eNodeB starts forwarding data to target eNodeB via direct link or indirect link.

answer May 21, 2014 by Vimal Kumar Mishra
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While handover procedure is being executed, target MME triggers created indirect data forwarding tunnel request to target SGW what does it means and what is the use of it ?

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While doing s1-based handover, indirect data forwarding tunnel procedure may be initiated. What are all position causes to get failure response from SGW ?

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I went through the call flow diagram that is shown in 23.401 specification and tried to understand data flow (down link and up link both) through indirect data tunnels. I was bit confused that's why post my query here.

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