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LTE - What will be destination address for DL packets that comes through GI interface?

+3 votes

What will be destination address for DL packets that comes through GI interface?
Is it PGW or MS address ?

posted Nov 30, 2013 by sivanraj

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1 Answer

+1 vote

Not just a LTE case even same applies to UMTS also.

Say UE is trying to access now supplies the result of the search i.e. the downlink data. Now assume PGW/GGSN has assigned the address IP) to the UE, PGW address is and address is

Now the packet with source IP as and destination as will reach to PGW (via LTE/UMTS network), now at PGW or any adjucent node will be natted to a public IP which is assigned to to operator say and will be forwarded to, will send the reply to the as destination which will reach at PGW which will be reverse natted to and Mobile network will drop it at UE.

answer Nov 30, 2013 by Salil Agrawal
nice Salil and can you also clarify how DL routed from Google server to and
For the server packet is coming from so it will reply back to which will be dropped to PGW because IP network is configured to drop the packet with dest address as at the PGW.
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There is no security at eGTP level . Does the IP-sec sufficient to achieve the security for eGTP messages ?

+1 vote

I read that when PGW's packet handler process maps an IP packet to a EPS bearer, it do DSCP marking.
And I also read DSCP marking is associated QCI of a bearer. How DSCP marking will help out to get maintained QoS of a bearer.

+2 votes

How P GW will select the S GW for Incoming Packet?
Consider two conditions
1. UE is in idle mode.

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