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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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+4 votes

There are couple of procedures are defined which consist of NAS as well as RRC signalling messages exchange.
Some of the NAS message sends to an UE through RRC Connection Reconfiguration message as piggybacked and some as DL Info transfer.

I want to know, Is there any procedure exists in lte when an UE receives RRC Connection Reconfiguration along with NAS message and responds back to network with NAS message first and then Reconfiguration Complete to eNodeB.

Usually, I saw UE sends RRC Connection Reconfiguration Complete message first then NAS response message.

+5 votes

As part of S1-AP procedure with MME relocation, Handover Required message sent to source MME. Target eNodeBId is present within the handover required. How source MME figure out target cell is being served by XYZ MME and sends "Forward relocation Request" message to XYZ MME.

Please provide reference also if it is there ?

+3 votes

Need clarity on following items:
1. What is the use of "UE selected plmn" information for an eNodeB ?
2. Is the ECGI/TAI constructed based on the primary plmn (PLMN broadcasted in 0th index in SIB1 ) or based on the UE selected PLMN ?

+1 vote

why does MME need the "UE Radio Capability" information for an UE during attach procedure ?

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