Condition to set 5G-TMSI

5G NR
1

Hi guys.
Please help to explain why we have condition to set the 5G-TMSI.
How network make use of it?

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2

Hi Mannu,

Ng-5G-S-TMSI -part 2 used to indicate N/W that UE is non NB-IOT UE .

please find below Reference for this.

1> consider the current cell to be the PCell;

1> set the content of RRCConnectionSetupComplete message as follows:

2> if the RRCConnectionSetup is received in response to an RRCConnectionResumeRequest :

3> if upper layers provide an S-TMSI:

4> set the s-TMSI to the value received from upper layers;

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

4> if the UE is a NB-IoT UE:

5> set the ng-5G-S-TMSI to the value received from upper layers;

4> else:

5> set the ng-5G-S-TMSI-Bits to ng-5G-S-TMSI with the value received from upper layers;

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

3> except for NB-IoT, set the ng-5G-S-TMSI-Bits to ng-5G-S-TMSI-Part2 to the leftmost 8 bits of 5G-S-TMSI received from upper layers;