Difference between revisions of "My Radio Technology beyond LTE - 38 series notes"
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'''7.2 Protocol States''' | '''7.2 Protocol States''' | ||
RRC supports the following states which can be characterised as follows: | RRC supports the following states which can be characterised as follows: | ||
* '''RRC_IDLE:''' | * '''RRC_IDLE:''' |
Revision as of 08:57, 20 September 2022
38.300
Section 7 Radio Resource Controller (RRC)
7.1 Services and Functions
The main services and functions of the RRC sublayer over the Uu interface include:
- 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 Radio Bearers (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.
The sidelink specific services and functions of the RRC sublayer over the Uu interface include:
- Configuration of sidelink resource allocation via system information or dedicated signalling;
- Reporting of UE sidelink information;
- Measurement configuration and reporting related to sidelink;
- Reporting of UE assistance information for SL traffic pattern(s).
7.2 Protocol States
RRC supports the following states which can be characterised as follows:
- 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 Inactive AS context is stored in NG-RAN and the UE;
- NG-RAN knows the RNA which the UE belongs to;
- Transfer of unicast data and/or signalling to/from the UE over radio bearers configured for SDT.
- 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.