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What feature of eNB gives direct S5 connectivity to P-GW and to the internet?

+1 vote
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What feature of eNB gives direct S5 connectivity to P-GW and to the internet?
posted Sep 22, 2015 by anonymous

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+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

+2 votes

while going through 3GPP 23.401, I stopped at PGW functionality. The following statement was written.
"If a UE is accessing multiple PDNs, there may be more than one PDN GW for that UE, however a mix of S5/S8 connectivity and Gn/Gp connectivity is not supported for that UE simultaneously". I couldn't understand it. Can someone please elaborate it.

+1 vote

Hi all

I find some information on internet of this question "What pros and cons of combined S-GW/P-GW?".
However it did not write the reasons.

I find this answer in http://www.cisco.com/c/dam/en/us/solutions/service-provider/mobile-internet/whitepaper_c11-577763_v1.pdf

It said that combined S-GW/P-GW have these advantages:
Reduced signaling overhead (S5 and S8 would be internal)
Fewer hops on the bearer path
Less backhaul
Reduced signaling on the S7 interface
Lower session requirement for the PGW

I cannot understand why it can reduce signaling on the S7 interface.
and although I probably know other advantages' reason, I am not sure.
Someone please tell me.

thanks

0 votes

As per LTE core network architecture, MME shares S11 interface with SGW and SGW has S5/S8 interface with PGW.
I went through Create Session Response message sent by SGW to MME and found PGW-C and PGW-U tunnel ids.
I want to know what MME does with these PGW-C and PGW-U tunnel Ids ?

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