Protocol data unit: Difference between revisions

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===Media access control protocol data unit===

A '''media access control protocol data unit''' ('''MAC PDU''' or '''MPDU''') is a message that is exchanged between [[media access control]] (MAC) entities in a communication system based on the layered [[OSI model]].<ref name=":0">{{Cite web |date=2006 |title=Wimax MAC-Upperlayer Services |url=http://www.comlab.hut.fi/opetus/4210/presentations/37_wimax_mac.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://www.comlab.hut.fi/opetus/4210/presentations/37_wimax_mac.pdf |archive-date=2022-10-09 |url-status=live |website=www.comlab.hut.fi |pages=12–15}}</ref>

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]].<ref name=":0" />