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On what basis an operator chooses GTP/PMIP between SGW and PDN-GW?

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When exactly a PMIP based tunnel is required to establish and What are the other use cases where PMIP tunnel can/should be established?

posted Jul 17, 2014 by anonymous

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2 Answers

+1 vote

If the legacy network is WCDM operator may chose GTP tunnel if it is EVDO it may chose PMIP.

answer Jul 17, 2014 by Amiya Kumar Sahoo
0 votes

In short PMIP is used when UE handedover from 3GPP network i.e. LTE to Non-3GPP network.

Some operators prefer using PMIP throughout their n/w as it facilitates connecting to non-3gpp accesses, whereas some operators want only GTP as their n/w is evolved from UMTS and they dont want too much hassles in managing different transport protocols. As a result of which, a user roaming between these two will not be supported home-routed traffic, he will only be local-breakout'ed. Therefore to support both home-routed and local breakout, S/PGWs have dual stacks.

Credit: http://tech.queryhome.com/7643/pmip-or-gtp-protocol

answer Jul 18, 2014 by Salil Agrawal
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0 votes

S5/S8 interface, what are the factors what decide whether PMIP or GTP protocol should be used and why ?

+2 votes

Hi all

Because combined S-GW/P-GW is one node, so do we still need to implement the connection between them?
Is it necessary for core network to implement GTP-based or PMIP based S5/S8 interface if it is combined S-GW/P-GW?

Is there any 3GPP spec mention about combined S-GW/P-GW? what is the cons and reasons to do this?

thanks

+4 votes

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 ?

+2 votes

When UE sends an attach request then on which bases MME selects S-GW for that UE?
does this information is passing from HSS with the subscriber profile information?

+1 vote

PDN connection is already established to a PDN-GW (PDN GW address was resolved by DNS resolution)
The HSS sends to the serving MME, S6a-IDR (Insert Subscriber Data) where the PGW-address (MIP6-Agent-info AVP) set to another IP-address is specified in the APN configuration.
Should the MME immediately tear down the existing PDN connection and re-establish a new connection with the PDN-GW present in the IDR message?

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