AdministratorWhat is RRC connection request in LTE?
RRC CONNECTION REQUEST message is used to request the E-UTRAN for the establishment of an RRC connection. It is sent as part of the Random Access procedure. It is transferred using SRB0 on the Common Control Channel (CCCH) because neither SRB1 nor a Dedicated Control Channel (DCCH) has been setup at this point.
What is RRC connection reestablishment?
The RRC Connection Re-establishment is one of the RRC main functions and re-establishes which involves the resumption of SRB1(Signalling Radio Bearer) operation, the re-activation of security and the configuration.
How many times UE re transmit RRC connection request if RRC connection setup is failed?
maximum number of re-transmissions is 8.
What is RRC in 5G?
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.
Why do we need RRC connection reconfiguration?
A RRC connection reconfiguration procedure is used to establish, modify or release radio bearers (e.g. DRBs (Data Radio Bearer)). In LTE, RRC connection reconfiguration also involves setting up a default EPS (Evolved Packet System) bearer between the UE and a core network (CN).
What is working of RRC?
The RRC protocol is the signaling exchanged between the mobile and the evolved Node Base station (eNB) over the LTE-Uu radio interface. The RRC protocol performs the following functions: – Broadcast of system information related to the characteristics of the radio interface.
What happens when UE receives RRC connectionreestablishment reject?
Once UE receives RRC ConnectionReestablishment Reject, the UE shall leave RRC_CONNECTED state with release cause “RRC Connection failure” Reference: 3GPP TS 36.331
What does “RRC Connection failed” mean?
This message is used to indicate the rejection of an RRC connection reestablishment request. Once UE receives RRC ConnectionReestablishment Reject, the UE shall leave RRC_CONNECTED state with release cause “RRC Connection failure”
What is RRC protocol in 5G?
Physical layer. 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. RRC messages are transported via the PDCP -Protocol.
How to trigger RRC connection from UE?
Or UE can trigger if it moves to a new Tracking Area and has to complete Tracking Area Update signaling procedure. Network can trigger by sending a Paging message. After a paging message has been sent by eNB, then RRC Connection setup request will be sent by the UE.