What is I-RNTI (inactive RNTI)?

The Inactive RNTI (I-RNTI) is applicable to the RRC Inactive State. I-RNTI is utilized to address the UE inside RRC flagging messages. The I-RNTI is utilized to distinguish both the UE and the gNB which hosts the UE context; when UE is portable, this is needed to move the UE context from one gNB then onto the next gNB while RRC Inactive. I-RNTI is of two types: Full I-RNTI: A full I-RNTI which has a length of 40 bits. And short I-RNTI: A short I-RNTI which has a length of 24 bits.