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LTE: How does MME of one network resolve address of HSS belong to other network in roaming scenarios ?

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LTE: How does MME of one network resolve address of HSS belong to other network in roaming scenarios ?
posted May 1, 2016 by Neeraj Mishra

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1 Answer

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MME queries to home HSS of visited UE based on its IMSI information. Following is the way to construct FQDN. For the inital request (Authentication-Information-Request ) message, MME does not know which HSS will handle the request but it know at least which network need to be contacted.
Destination Realm: epc.mcc<>.mnc<>.3gppnetwork.org
Source Host: mmec2.mmegi1.mme.epc.mcc<>.mnc<>.3gppnetwork.og

Hope you understood now. If you still need any clarification then please ping me.

answer May 2, 2016 by Harshita
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