Diagram shows an example of MAC PDU construction.
As shown multiple SDUs can be packed in a single MAC PDU or a single SDU can be fragmented in multiple MAC PDUs. Packing (PSH) and Fragmentation (FSH) in the PDU can be indicated using 6 bit TYPE filed in GMH. Blocks of these packed or fragmented SDUs are assined a unique 3bit or 11bit Block Sequence Number (BSN).
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