RRC Radio Resource Control Protocol

RRC Radio Resource Control Protocol

Services and Functions

The main services and functions of the RRC

  • Broadcast of System Information related to AS and NAS.
  • Paging initiated by 5GC or NG-RAN
  • Establishment, maintenance, and release of an RRC connection between the UE and NG-RAN including( Addition, modification, and release of carrier aggregation) & Addition, modification, and release of Dual Connectivity in NR or between E-UTRA and NR.
  • Security functions including key management
  • Establishment, configuration, maintenance, and release of Signalling Radio Bearers (SRBs) and Data RadioBearers (DRBs).

Mobility functions including

  • Handover and context transfer
  • UE cell selection and reselection and control of cell selection and reselection
  • Inter-RAT mobility

QoS management functions

  • UE measurement reporting and control of the reporting.
  • Detection of and recovery from radio link failure.
  • NAS message transfer to/from NAS from/to UE.

Protocol States

RRC_IDLE

  • PLMN selection;
  • Broadcast of system information;
  • Cell re-selection mobility;
  • Paging for mobile terminated data is initiated by 5GC;
  • DRX for CN paging configured by NAS.

RRC_INACTIVE

  • PLMN selection;
  • Broadcast of system information;
  • Cell re-selection mobility;
  • Paging is initiated by NG-RAN (RAN paging);
  • RAN-based notification area (RNA) is managed by NG- RAN;
  • DRX for RAN paging configured by NG-RAN;
  • 5GC – NG-RAN connection (both C/U-planes) is established for UE;
  • The UE AS context is stored in NG-RAN and the UE;
  • NG-RAN knows the RNA which the UE belongs to.

RRC_CONNECTED:

  • 5GC – NG-RAN connection (both C/U-planes) is established for UE;
  • The UE AS context is stored in NG-RAN and the UE;
  • NG-RAN knows the cell which the UE belongs to;
  • Transfer of unicast data to/from the UE;
  • Network controlled mobility including measurements.

Comments

  • Pedro
    July 18, 2020

    Good information

  • Ahmad
    July 18, 2020

    Hello

  • Ahmad
    July 18, 2020

    Hello,

    I want to join the webinar

  • Diego Fino
    July 19, 2020

    I want to begin to learn about 5G

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