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Can single SGW connect to multiple PGW?If yes ,please explain the scenario?

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Can single SGW connect to multiple PGW?If yes ,please explain the scenario?
posted Sep 11, 2017 by Sakshi Rai

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1 Answer

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It is correct, one SGW may have connection with multiple PGWs because SGW selection is done by MME based on current location of UE while PGW is selected based on the APN UE wants to connect or the Service UE wants. SGW and PGW both the nodes communicate to each other by using GTP and GTP works over the connection less transport protocol UDP.
The purpose of both the nodes in the LTE network is different.

answer Sep 12, 2017 by Ganesh
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Hi Friends,
I saw somewhere that MME will also do a DNS query for P-GW. As i know S-Gw will do a query for P-Gw address. Is there any situation that MME will do a query for P-GW address using APN? and after this query how MME will use the P-Gw Address.

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