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LTE: How does MME find PGW IP address serving an APN so that it can send CS Request to right PGW ?

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In the deployed network,

posted May 11, 2018 by Ganesh

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1 Answer

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MME may get this information from HSS in User-Location-Answer message. In case, HSS does not include MIP-Agent-Info AVP in ULA, MME will use local policies and configuration to get PGW IP address. HSS provides either FQDN or IP address for PGW.

answer May 11, 2018 by Vimal Kumar Mishra
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why MME will query for PGW prior to SGW

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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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