Chapter 8

Medium Access Control Functions

The layer-2 functions in LTE are classified into medium access control, radio link control, and packet data convergence protocol functions. The MAC sublayer is responsible for data transfer and logical channel multiplexing, HARQ retransmissions and uplink/downlink scheduling, random access procedure, and maintenance of uplink timing. It is also responsible for multiplexing/de-multiplexing of data across multiple component carriers when carrier aggregation is used. From physical layer perspective, MAC sublayer provides and receives services in the form of transport channels. The data in a transport channel is organized into transport blocks. By varying the transport format of the transport blocks, the MAC ...

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