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Wireless & Mobility · Advanced

Aggregate MAC Protocol Data Unit (A-MPDU)

Multiple MPDUs, each with its own MAC header and FCS, combined into one PPDU.

Definition

Because each MPDU has its own FCS, only corrupted subframes need retransmission, acknowledged through a block ACK. A-MPDU size limits increased with each generation. A-MPDU is the most commonly used aggregation method.

Exam tip

A-MPDU uses per-subframe FCS and block ACK, making it more robust than A-MSDU.

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