Section: 10.8 Cross Carrier Scheduling
Content: 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 PCell is not configured, PCell can only be scheduled via its PDCCH; - When cross-carrier scheduling from an SCell to PCell is configured: - PDCCH on that SCell can schedule PCell's PDSCH and PUSCH; - PDCCH on the PCell can schedule PCell'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 PCell. - 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.