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Draft: Use 5G-S-TMSI in RRCSetupRequest (5.3.3.3. of TS 38.331 ) and rework of NAS RegistrationRequest

Guido Casati requested to merge nr-ue-nas-5g-s-tmsi into develop

This MR includes the following implementation:

  • TS 38.331 5.3.3.3 Actions related to transmission of RRCSetupRequest message:

The UE shall set the contents of RRCSetupRequest message as follows:

1> set the ue-Identity as follows:

2> if upper layers provide a 5G-S-TMSI:

3> set the ue-Identity to ng-5G-S-TMSI-Part1;

  • Rework of RegistrationRequest:

  • NAS sends a NAS Registration Request:

    • at startup
    • when RRC state is set to IDLE, which means after RRC informing NAS about UEs in RRC_IDLE mode (4.3.1 of TS 38.331)

  • NAS -> RRC: RRC receives an ITTI message with NAS message that is stored in the RRC instance and later encoded as dedicatedNASMessage in RRCSetupComplete

  • send indication from NAS to RRC when GUTI is available and store 5G-S-TMSI

  • Initial implementation of Initial NAS Message: Service Request

WIP:

  • Proper NAS and security procedures after UE goes into RRC IDLE

Closes #772

Edited by Guido Casati

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