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LTE: How a MME find out current serving plmn for an UE as selected plmn is communicated in RRC message ?

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UE send selected PLMN information to eNodeB by using the RRC connection setup complete message. How MME comes to know about selected PLMN since I did not find selected PLMN ID inS1-AP "Intial Ue Message" ?

posted May 28, 2018 by Vikram Singh

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1 Answer

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I am not sure but I think after receiving the S1-AP "Initial UE message", MME comes to know about current serving tracking area identity which is nothing but the combination of tracking area code and current serving PLMN. This is how MME retrieves serving PLMN for the UE.

answer May 29, 2018 by Harshita
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