The Radio Resource Control (RRC) protocol is used in UMTS, LTE and 5G on the Air interface. It is a layer 3 (Network Layer) protocol used between UE and Base Station . This protocol is specified by 3GPP in TS 25.331 for UMTS, in TS 36.331 for LTE and in TS 38.331 for 5G New Radio.
Read moreWhat is RRC message?
The RRC messages are encrypted and checked for integrity . The RRC ConnectionReconfiguration message is used by the eNB entity to command a modification of the RRC connection. This message may relate to the configuration of the measurements, control of the mobility and configuration of the DRB default bearer.
Read moreWhat is RRC setup?
LTE RRC connection setup. Establishing an RRC connection in LTE typically involves the following steps: UE initiates a session to the eNodeB using a random RA-RNTI. eNodeB assigns a C-RNTI and sends timing adjustment to the UE. UE adjusts the timing and sends an RRC Connection Request via the UL-SCH channel.
Read moreWhat are RRC states?
There are three RRC states; RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED are defined for a 5G NR UE. While RRC_IDLE and RRC_CONNECTED states in NR are almost same as those of LTE, the RRC_INACTIVE states is newly introduced in 5G NR.
Read moreWhat are RRC states in LTE?
In LTE there is only 2 RRC states i.e. RRC_IDLE and RRC_CONNECTED whereas in UMTS system RRC has a 5 state i.e. IDLE, CELL_FACH, CELL_DCH, CELL_PCH and URA_PCH.
Read moreWhat is RRC reestablishment?
The purpose of RRC CONNECTION RE-ESTABLISHMENT procedure is to re-establish the RRC connection, which involves the resumption of SRB1 operation and the re-activation of security (without changing algorithms).
Read moreWhat is RRC connection setup?
The RRC CONNECTION SETUP message is used to establish SRB1 . It contains configuration information for SRB1. This allows subsequent signaling to use the DCCH logical channel. The configuration for SRB1 can be a specific configuration or the default configuration.
Read more