MAC protocol data unit or MPDU is a message (Protocol data unit) exchanged between MAC entities in a communication system based on the layered OSI model.
In systems where the MPDU may be larger than the MAC service data unit (MSDU), the MPDU may include multiple MSDUs as a result of packet aggregation. In systems where the MPDU is smaller than the MSDU, then one MSDU may generate multiple MPDUs as a result of packet segmentation.
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