What is RRC in UMTS?

What is RRC in UMTS?

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.

What 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.

What is RRC establishment cause?

The RRC-Establishment-Cause IE indicates to the MME the reason for RRC Connection Establishment.

What is RRC reconfiguration?

RRC CONNECTION RECONFIGURATION message is the command to modify an RRC connection. The purpose of this procedure is, · To establish/modify/release Radio Bearers. · To perform Handover. · To setup/modify/release Measurements.

What is RRC connection establishment in LTE?

Establishing an RRC connection in LTE typically involves the following steps: UE initiates a session to the eNodeB using a random RA-RNTI. UE adjusts the timing and sends an RRC Connection Request via the UL-SCH channel. The eNodeB sends the RRC Connection Setup to the UE on the DL-SCH channel.

What is the main purpose of RRC?

The RRC protocol performs the following functions: broadcasting information system, control of the connection, control of the radio bearer, control of handover, transfer of measurement reports.

What is RRC release?

The RRC CONNECTION RELEASE message is used to command the release of an RRC connection. E-UTRAN initiates the RRC connection release procedure to an UE in RRC_CONNECTED state. The RRC CONNECTION RELEASE procedure with redirection information can also be used for CS-fallback to GERAN or UTRAN.

What 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 are the condition of re establishment and re configuration in LTE?

The UE initiates the RRC CONNECTION RE-ESTABLISHMENT procedure when one of the following conditions is met: Upon detecting radio link failure; or. Upon handover failure; or. Upon mobility from E-UTRA failure; or.

What is the function of RRC in LTE?

The RRC layer performs the following functions such as broadcast of system information, paging, establishment/release of an RRC connection, transfer of NAS information, AS security configuration, transfer of UE radio access capability, measurement configuration and reporting and mobility control.

What is meant by RRC?

Railway Recruitment Board (RRB) vs Railway Recruitment Cell (RRC) The Railway Recruitment Board (RRB) handles the recruitment of Group C and the Railway Recruitment Cell (RRC) handles the recruitment of Group D posts. The exams conducted by both RRB and RRC are for candidates recruitment under the Government of India.

What are the two modes of RRC?

6.1 General. An overall picture of the transitions between RR modes of operation and RRC states and modes is in Figure 6.1. 1. The RRC modes are RRC-Idle mode and RRC-Connected mode.

How does UE trigger RRC Connection establishment procedure?

UE must change the state from RRC Idle to RRC Connected before it can transfer any application data or signaling procedures. RRC Connection Establishment can be triggered by UE or by network. If the application needs to send a message, then it can trigger.

How often does UMTS send RRC Connection Request message?

The value of T300 is broadcast within SIB 2. UMTS uses T300 in combination with N300 to manage re-transmissions of the RRC Connection Request message. LTE does not have an N300 parameter and the RRC Connection Request message is sent only once per establishment procedure.

How does the UE initiate a RRC request?

For UE initiated calls, the higher layers of the UE send a request to RRC layer to establish a signaling connection establishment. Upon receiving this, the RRC of the UE initiates a connection establishment procedure with the peer RRC of the UTRAN by sending an RRC connection request message through the MAC.

How is the establishment cause of a RRC request determined?

 The establishment cause within the RRC Connection Request message is determined by the Non-Access Stratum (NAS) procedure for which the connection is being established. The relationship between establishment cause and NAS procedure is specified by 3GPP TS 24.301.