Frame Aggregation in 802.11ac: Need for Modified Block ACK
Frame Aggregation in 802.11ac: Need for Modified Block ACK
复制标题
802.11ac 中的帧聚合：需要修改的块 ACK
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
B. Raman
中科院分区：
文献类型：
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作者：
M. Inamullah;B. Raman
802.11n和ac中的帧聚合提供了更高的吞吐量，因为更大的聚合减少了帧间定时开销。当聚合（A-MPDU）大小被迫更小时，吞吐量益处减少。在正常操作期间，由于各个组成子帧的丢失，A-MPDU大小从可能的最大值下降。在最坏的情况下，大小可以低至单个子帧。我们表明，与最坏的情况相比，全尺寸A-MPDU可以为802.11ac的最高MCS指标提供高达400%的吞吐量。在本文中，我们解释了固定块ACK大小加上子帧重传如何成为A-MPDU大小减少的主要原因。我们提出了修改块ACK机制需要达到更大的聚合，即使在存在的子帧丢失。
Frame aggregation in 802.11n and ac gives higher throughputs because larger aggregates reduce inter-frame timing overheads. When aggregate (A-MPDU) sizes are forced to be smaller the throughput benefit dwindles. During normal operation the A-MPDU sizes fall from the maximum possible due to the loss of individual constituent subframes. In the worst case, the size can be as low as a single subframe. We show that, compared to the worst case, full-sized A-MPDUs can give up to 400% higher throughput for the highest MCS indexes of 802.11ac. In this paper, we explain how fixed block ACK size coupled with subframe retransmission are the main causes of reduction in A-MPDU size. We present the modification in the block ACK mechanism needed to attain larger sizes of aggregates even in the presence of subframe losses.