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LTE : In which scenario, UE sends "random number" within the RRC connection request message ?

+1 vote
1,271 views

Usually, I always saw when UE sends "S-TMSI" in RRC connection Request message then it definitely sends "Registered MME Information " in RRC Connection Setup Complete message.

I am looking for a scenario on which UE sends "Random number" in RRC Connection Request message and "Registered MME Information" in RRC Connection Setup Complete message.

posted Jan 13, 2016 by Vimal Kumar Mishra

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1 Answer

+1 vote

As per 24.301...

When the UE is not registered in the tracking area of the current cell during the NAS signalling connection
establishment, the UE NAS does not provide the lower layers with the S-TMSI. If the UE has a valid registered
MME identifier from a previous registration, the UE NAS shall provide the lower layers with the registered
MME identifier.

So in this scenario when ue is making rrc connection with cell having not registed tracking area, UE will send random number in rrc Connection request and registered MME info in rrc Connection complete msg.

answer Jan 21, 2016 by Veer Pal Singh Yadav
Thanks a lot Veer Pal Singh Yadav for your answer.
commented Jan 22, 2016 by Vimal Kumar Mishra
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