15.5.1.2 Load reporting for intra-RAT and intra-system inter-RAT load balancing

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.