Section: 15.5.1.2 Load reporting for intra-RAT and intra-system inter-RAT load balancing
Content: The load reporting function is executed by exchanging load information over the Xn/X2/F1/E1 interfaces. The following load related information should be supported which consists of: - Radio resource usage (per-cell and per SSB area PRB usage: DL/UL GBR PRB usage, DL/UL non-GBR PRB usage, DL/UL total PRB usage, and DL/UL scheduling PDCCH CCE usage; PRB usage for slice(s): DL/UL GBR PRB usage, DL/UL non-GBR PRB usage, and DL/UL Total PRB allocation); - TNL capacity indicator (UL/DL TNL offered capacity and available capacity); - Cell Capacity Class value (UL/DL relative capacity indicator); - Capacity value (per cell, per SSB area and per slice: UL/DL available capacity); - HW capacity indicator (offered throughput and available throughput over E1, percentage utilisation over F1); - RRC connections (number of RRC connections, and available RRC Connection Capacity); - Number of active UEs; - NR-U channel load (DL/UL channel occupancy time percentage, DL/UL energy detection threshold, radio resource usage). To achieve load reporting function, Resource Status Reporting Initiation & Resource Status Reporting procedures are used. 15.5.1.3 Load balancing action based on handovers The source cell may initiate handover due to load. The target cell performs admission control for the load balancing handovers. A handover preparation related to a mobility load balancing action is distinguishable from other handovers, so that the target cell is able to apply appropriate admission control.