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How to generate a random value for UE identity in RRC connection request at initial attachment to network

Hi,

Can any one pls suggest/give referece TS number for how generate a random value for UE identity in RRC connection request at initial attachment to network.

Regards
Ramesh

If the UEi has a valid

If the UE has a valid S-TMSI, the UE includes it in the RRC connection request message. Otherwise the UE includes a 40 bit random value. 3GPP 36.331 provides range but did not offer equation. It is left to implementation.