Adaptive A-MPDU retransmission scheme with two-level frame aggregation compensation for IEEE 802.11n/ac/ad WLANs

The aggregate MAC protocol data unit (A-MPDU) is one of the significant frame aggregation schemes to improve the performance for high-rate IEEE 802.11n/ac/ad wireless local area networks (WLANs). However, the performance of the A-MPDU scheme does not meet the user expectations because the frame length of the retransmitted A-MPDU will be inevitably and sharply reduced due to the effect of the lost subframe on the number of the aggregatable subframes (i.e., the aggregation level). To overcome this problem, an adaptive A-MPDU retransmission scheme with the two-level frame aggregation compensation is proposed. In this scheme, when the aggregation level of the retransmitted A-MPDU frame dramatically decreases, one of the appropriate two-level aggregation strategies is adaptively employed to compensate the length of the retransmitted A-MPDU frames according to the theoretical analysis of the throughput performance for the conventional A-MPDU scheme and two strategies of the two-level aggregate frame respectively. Simulations using ns-3 platform are performed and the results demonstrate that the proposed adaptive A-MPDU retransmission scheme can achieve higher throughput and medium access control (MAC) layer efficiency.

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