Multi-carrier HSPA (MC-HSPA)
The aggregation of more than two carriers has been studied and 3GPP Release 11 is scheduled to include 4-carrier HSPA. The standard is scheduled to be finalised in Q3 2012 and first chipsets supporting MC-HSPA in late 2013. Release 11 specifies 8-carrier HSPA allowed in non-contiguous bands with 4x4 MIMO offering peak transfer rates up to 672 Mbit/s.
Read more about this topic: High Speed Packet Access