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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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+1 vote

GTP tunnel id is a 32-bit long value over one IP address combination. Suppose there are two nodes A and B which has IP addresses X and Y respectively. Is it possible when first GTP tunnel id range gets exhausted then both the nodes starts using different IP address combination and again GTP tunnel id range can be re-used ? If it is impossible then what could be the reason ?

+1 vote

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.

and is there any possibility of Doing DNS query by P-Gw to get any other nodes Ips and under what conditions P-Gw will do a DNS query?

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