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LTE: How does MME knows that UE is looking for LIPA PDN connectivity ?

+3 votes
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Is there any information sent by UE to MME in Attach Request so that MME can find out the necessity of LIPA PDN connectivity ?

posted Jan 2, 2014 by Harshita

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1 Answer

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To get access to devices on a local network to which a femto is connected to, the mobile device can use a special APN. The APN tells the SGSN (UMTS) or the MME (LTE) that the mobile device wants to get a connection to the local network and not to the network operator’s core network. Optionally, a LIPA flag is defined that can be sent by the mobile device during the PDP context establishment (UMTS) or the Default Bearer activation (LTE) for the same purpose (This requires some additional software in the mobile device).

Reference: http://tech.queryhome.com/26590/lte-call-flow-to-setup-a-bearer-in-lipa-architecture

answer Jan 2, 2014 by Luv Kumar
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I have one doubt over S5 interface. Interface between SGW and PGW in lte core known as S5 interface. Now I found again S5 interface between L-GW( which is co-located with HeNB ) and SGW of core network. Can someone please explain why this interface is required ?

+4 votes

I am looking for a complete call flow to setup a bearer in lte network including Local IP access(LIPA). Thanks in advance.

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