10.8 Cross Carrier Scheduling

Cross-carrier scheduling with the Carrier Indicator Field (CIF) allows the PDCCH of a serving cell to schedule resources on another serving cell but with the following restrictions:

• When cross-carrier scheduling from an SCell to SpCell is not configured, SpCell can only be scheduled via its PDCCH;
• When cross-carrier scheduling from an SCell to SpCell is configured:
• PDCCH on that SCell can schedule SpCell's PDSCH and PUSCH;
• PDCCH on the SpCell can schedule SpCell's PDSCH and PUSCH but cannot schedule PDSCH and PUSCH on any other cell;
• Only one SCell can be configured to be used for cross-carrier scheduling to SpCell.
• When an SCell is configured with a PDCCH, that cell's PDSCH and PUSCH are always scheduled by the PDCCH on this SCell;
• When an SCell is not configured with a PDCCH, that SCell's PDSCH and PUSCH are always scheduled by a PDCCH on another serving cell;
• The scheduling PDCCH and the scheduled PDSCH/PUSCH can use the same or different numerologies.