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LTE: When the ESM Information Request message is sent by the MME to the UE ?

+2 votes

What is the objective to send the ESM Information Request message to UE ? Does it part of attach procedure ?

posted Mar 24, 2014 by Vimal Kumar Mishra

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3 Answers

+1 vote

When UE wants to provide the ESM information security protected, it enables a flag "ESM information security protected" in the PDN connectivity req(as a part of Initial Attach). Therefore the MME can obtain ESM info only after it establishes the NAS security context, which, once done, MME sends a ESM information req to UE to obtain ESM related information such as the PCO, APN, ECGI,TAI.

answer Mar 27, 2014 by Chandra Javalkar
0 votes

In ESM Information Request message, this signaling used to check the imei info; firstly will check with the old mme, if the old mme doesn't have this info, then it will send to ue in order to get imei info, this is part of the attach procedure.

answer Mar 24, 2014 by Clark Ken
0 votes

In attach request message if UE set ESM information transfer flag ( The UE shall include this IE in the PDN CONNECTIVITY REQUEST message sent during the attach procedure if the UE has protocol configuration options (PCO) that need to be transferred security protected or wishes to provide an access point name(APN) for the PDN connection to be established during the attach procedure) ,before proceeding create session request MME will send ESM information request to UE .Yes its part of attach procedure

answer Jun 25, 2014 by Bheemappa G
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+2 votes

Does UE send APN information while registering with network using the "Attach request" message ?
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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.

+3 votes

When this message is sent by Network to an UE ? There are couple of optional IEs within the message, what significance of their presence within the message ?

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