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  • RRC Layer Interview Quetions and Answers 6-10

    Q6. How many times UE re transmit RRC connection request if RRC connection setup is failed?

    Ans N300 can be set to any integer value from 0 to 7.
    This setting specifies the maximum number of retransmissions of the RRC Connection Request message.
    T300 RRC Conn Request Retransmit Timer
    This setting determines how long the UE waits for the RRC Connection Setup after sending an RRC Connection Request.
    T300 can be set to one of the following values: 100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 3000, 4000, 6000, 8000 milisecond.

    Q7. What are the Information Element are present in RRC Connection Request? And the channel name, RLC mode, SRB?

    Ans The RRCConnectionRequest message is used to request the establishment of an RRC connection.
    Signalling radio bearer: SRB0
    RLC: TM Mode
    Logical channel: CCCH
    Direction: UE to E-UTRAN
    LTE RRC Connection Request
    RRC Connectio IEs

    Q8. What is the 2nd message of RRC Layer? What Information Elements are present in this message, channel name, RLC mode, and SRB?

    Ans The 2nd message of RRC Layer is RRC Connection Setup.
    Signalling radio bearer: SRB0
    RLC-SAP: TM
    Logical channel: CCCH
    Direction: E-UTRAN to UE
    lte RRC Connection Setup message
    RRC Connection Setup IEs

    Q9. RRC connection setup complete what is the channel name, RLC mode and SRB? Name of NAS message present inside there and Information Elements and timer duration?

    Ans The RRCConnectionSetupComplete message is used to confirm the successful completion of an RRC connection establishment.
    Signalling radio bearer: SRB1
    RLC-SAP: AM
    Logical channel: DCCH
    Direction: UE to E-UTRAN
    lte RRC Connection Setup Complete message
    lte RRC Connection Setup Complete message

    Q10. What are the reason/causes of RRC connection reject?

    Ans The RRCConnectionReject message is used to reject the RRC connection establishment.
    Signalling radio bearer: SRB0
    RLC-SAP: TM
    Logical channel: CCCH
    Direction: E-UTRAN to UE
    (I)Transmission of an RRC CONNECTION REJECT message by the eNodeB to the UE or an expected RRC CONNECTION SETUP COMPLETE message not received by the eNodeB.
    (II)Each transmitted RRC CONNECTION REJECT message caused by “congestion”
    lte RRC connection reject message
    RRC Connection Reject IEs

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