When determining search spaces SS_scheduled,2 and SS_scheduled,3 of the CC#2 and the CC#3 for data scheduling, the base station determines, according to a size of the search space configured for the scheduling carrier CC#1 and a scaling factor K, sizes of the two search spaces, that is, the included aggregation levels and the quantity of PDCCH candidates included in each aggregation level.

The scaling factor is determined by the following formula.

For a scaling factor K2 of the carrier CC#2.

$K??2=\frac{M_{\mathrm{cap},\mathrm{scheduled},2}}{M_{\mathrm{cap},\mathrm{scheduling}}}\times \frac{{\mathrm{SCS}}_{\mathrm{scheduled},2}}{{\mathrm{SCS}}_{\mathrm{scheduling}}}=\frac{36}{44}\times \frac{30}{15}=1.64$

For a scaling factor K3 of the carrier CC#3,