A base station includes a plurality of system-on-a-chip (SOC) boards, which each include a plurality of SOC devices to support wireless communication on a plurality of carriers. One of the SOC devices is a transport SOC (TSOC) device that terminates a backhaul interface for receiving downlink radio bearer packets. Each of the SOC devices configures the TSOC device to route downlink radio bearer packets to a packet data convergence protocol (PDCP) module in the SOC device.