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What will be the MSG3 in TAU initiated contention based RACH in LTE?

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weather it is RRCConnection request or direct NAS message as ULInfotransfer?

posted Aug 7, 2018 by Ankit Mishra

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2 Answers

+1 vote

TAU request is a NAS message and it will be piggybacked in RRC connection setup complete message just like other NAS messages are piggybacked in RRC connection setup complete. Once SRB2 is established, NAS message through SRB2 if NAS message is independent from RRC signalling.
MSG3 will be RRC connection Request message.

answer Aug 8, 2018 by Vimal Kumar Mishra
0 votes

TAU request can be periodic or event based. This will first require MME to page all eNBs serving the tracking area and the UE which is paged shall trigger a service request requiring establishment of rrcConnection again which implies it should be rrcConnectionRequest as MSG3 after successful RACH procedure.

answer Aug 17, 2018 by Anshul Grover
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