Data scheduling on multi-carrier has been deployed to achieve higher data rates and load balancing. With the
introduction of intra/inter-band features like DC-HSPA/DB-DC-HSPA, data can be scheduled over two carriers in the
same band or in different bands. Along with the trend that the basic frequency for MBB coverage is a lower band, e.g.
900MHz, carrier aggregation of two carriers in a lower band and a higher band (cross band carrier aggregation), would
become a typical deployment scenario for multi-carrier application.
In cross band carrier aggregation, the reliability of scheduling channels as HS-SCCH or E-AGCH, on the higher and
lower frequency carriers is not the same. Assuming the primary carrier is the lower band, the scheduling channels on the
secondary carrier are not as reliable as the ones on the primary carrier due to the higher path loss in the higher band.
Assuming scenarios where the secondary carrier operates in the higher frequency, in order to improve the performance
of cross band carrier aggregation, the reliability of scheduling channels over the secondary carrier using the higher band
should be investigated.