10.0 General

36.3003GPPEvolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN)Overall descriptionRelease 17Stage 2TS

Load balancing is achieved in E-UTRAN with handover, redirection mechanisms upon RRC release, DC and through the usage of inter-frequency and inter-RAT absolute priorities and inter-frequency Qoffset parameters.

Measurements to be performed by a UE for mobility are classified in at least four measurement types:

– Intra-frequency E-UTRAN measurements;

– Inter-frequency E-UTRAN measurements;

– Inter-RAT measurements for UTRAN and GERAN;

– Inter-RAT measurements of CDMA2000 HRPD or 1xRTT frequencies.

For each measurement type one or several measurement objects can be defined (a measurement object defines e.g. the carrier frequency to be monitored).

For each measurement object one or several reporting configurations can be defined (a reporting configuration defines the reporting criteria). Three reporting criteria are used: event triggered reporting, periodic reporting and event triggered periodic reporting.

The association between a measurement object and a reporting configuration is created by a measurement identity (a measurement identity links together one measurement object and one reporting configuration of same RAT). By using several measurement identities (one for each measurement object, reporting configuration pair) it is possible:

– To associate several reporting configurations to one measurement object and;

– To associate one reporting configuration to several measurement objects.

The measurements identity is as well used when reporting results of the measurements.

Measurement quantities are considered separately for each RAT.

Measurement commands are used by E-UTRAN to order the UE to start measurements, modify measurements or stop measurements.

For NB-IoT:

– Handover, measurement reports and inter-RAT mobility are not supported;

– 10.1.1 Mobility Management in ECM-IDLE, 10.1.3 Measurements, 10.1.4 Paging and C-plane establishment, 10.1.5 Random Access Procedure, 10.1.6 Radio Link Failure, 10.1.7 Radio Access Network Sharing and all their clauses are applicable;

– 10.2.6 Idle mode Inter-RAT Cell Selection to/from NB-IoT is supported;

– All other subclauses of clause 10 are not applicable.