What are the different types of Rnti in 5G?

What are the different types of Rnti in 5G?

In 5G, various types of Radio Network Temporary Identifiers (RNTIs) are used for different purposes. Cell-RNTI (C-RNTI) identifies a user equipment (UE) within a cell, while Temporary C-RNTI (TC-RNTI) is used temporarily, often during handovers. Paging-RNTI (P-RNTI) is for paging UEs with incoming data or calls, and System Information-RNTI (SI-RNTI) is for accessing network information.

Random Access-RNTI (RA-RNTI) helps during initial UE connection, and Contention Resolution-RNTI (CR-RNTI) distinguishes UEs contending for resources. There are also specialized RNTIs like TCAS-RNTI, TCPS-RNTI, TC-SIB-RNTI, and TC-RACH-RNTI for specific signaling purposes, ensuring efficient 5G network manage

Here are the different types of RNTIs in 5G:


  • C-RNTI is used to identify a UE (User Equipment) within a specific cell.
  • It’s typically assigned when a UE initially connects to the network and communicates with the base station (gNB, gNodeB) in that cell.
  • C-RNTI is temporary and can change when the UE moves to a different cell.

Temporary C-RNTI (TC-RNTI):

  • TC-RNTI is used in cases where a C-RNTI is required temporarily, often during handovers or specific procedures.
  • It’s used to ensure the continuity of communication when a UE moves from one cell to another.

Paging-RNTI (P-RNTI):

  • P-RNTI is used for paging a UE when there is incoming data or a call for the UE.
  • It helps the network locate and inform the UE that there is data waiting for it to receive.

System Information-RNTI (SI-RNTI):

  • SI-RNTI is used to identify and access system information broadcasted by the base station.
  • This information includes cell-specific parameters, configuration details, and other essential network information.

Random Access-RNTI (RA-RNTI):

  • RA-RNTI is used during the random access procedure when a UE initially tries to connect to the network.
  • It helps the network identify and allocate resources for the UE’s initial connection request.

Contention Resolution-RNTI (CR-RNTI):

  • CR-RNTI is used during the contention resolution phase of the random access procedure.
  • It helps the network differentiate between UEs contending for the same resources during the initial access.

TCAS-RNTI (Temporary Cell-RNTI for Associated Signaling):

TCAS-RNTI is used for signaling associated with specific functionalities, such as control plane recovery.

TCPS-RNTI (Temporary Cell-RNTI for Paging and System Information):

TCPS-RNTI is used for paging and system information-related signaling during certain procedures.

TC-SIB-RNTI (Temporary Cell-Specific System Information Block-RNTI):

  • TC-SIB-RNTI is used for temporary cell-specific system information blocks.
  • It helps the UE receive specific system information from the network.

TC-RACH-RNTI (Temporary Cell-Random Access Channel-RNTI):

TC-RACH-RNTI is used during temporary random access procedures.

These different types of RNTIs in 5G play a role in managing and controlling the communication between UEs and the network infrastructure. They enable efficient resource allocation, handover procedures, paging, and system information dissemination, ensuring the smooth operation of 5G networks.

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