- release the radio bearer and remove the UE context. The mobile goes to the RRC IDLE state and the UE context goes to the CM IDLE state at the AMF level. In the RRC_IDLE state, the mobile listens to the information sent by the NG-RAN node. In the RRC_IDLE state, cell reselection is managed by the mobile. 1.3.1.2. The identity of the mobile at the level of NG-RAN Each NG-RAN node manages a set of mobiles. The NG-RAN node assigns a specific RNTI radio identifier to each mobile. A broadcast identifier is also used to broadcast information like the common control channel and information system. Consequently, for any mobile in the standby mode, the NG-RAN node uses the following radio identities: - P-RNTI (Paging) to send a paging request; - SI-RNTI (System Information) to broadcast SIB messages; - RA-RNTI (Random) to identify a mobile when requesting radio access (random access procedure; see Chapter 3); - TC-RNTI (Temporary Cell) which helps to retrieve the information exchanged during the connection procedure, following the random procedure. If the mobile is in the RRC INACTIVE state (in the standby mode) on the NG-RAN, its identifier is called I-RNTI. If the mobile is in the RRC_CONNECTED state, connected with the NG-RAN node, then several radio identities are used per mobile: - C-RNTI (Cell): unique identification of the mobile for the RRC connection and for scheduling; - CS-RNTI (Configured Scheduling): radio identifier of the mobile for the RRC connection and for semi-persistent scheduling; - SP-CSI-RNTI (Semi-Persistent): radio identifier of the mobile used for the transmission of radio channel information (CSI: Channel State Information) on the uplink traffic channel with semi-persistent scheduling; NG-RAN Network - Functional Architecture - MCS-RNTI (Modulation Coding Scheme): radio identifier of the mobile to indicate the modulation and coding scheme (MCS) of the mobile for the transmission of data on the downlink and uplink traffic links; - TPC-RNTI (Transmit Power Control RNTI) is used to retrieve the in