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Figure shows the functionality split between the MAC scheduler and the remaining MAC. For the purposes of describing the MAC scheduler interface the MAC consists of a control block and a subframe block, which uses the CSCHED and SCHED SAP respectively. The subframe block triggers the MAC scheduler every TTI and receives the scheduler results. The control block forwards control information to the MAC scheduler as necessary. The scheduler consists of the following blocks:

UL Is responsible for scheduling of the PUSCH resources.

DL Is responsible for scheduling of the PDSCH resources.

PDCCH/RACH Is responsible for shared resources between UL and DL.

HARQ Is responsible for handling HARQ retransmissions, keeping track of the number of retransmissions and redundancy versions.

Cell Cfg Stores the UE configuration needed by the MAC scheduler.

UE Cfg Stores the UE configuration needed by the MAC scheduler. LC Cfg Stores the logical channel configuration needed by the MAC scheduler. Sched Cfg Stores the scheduler-specific configuration needed by the MAC scheduler.

CSCHED – MAC Scheduler Control SAP:

CSCHED_CELL_CONFIG_REQ/CNF: 

CSCHED_UE_CONFIG_REQ/CNF: