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On the impact of HARQ on the throughput and energy efficiency using cross-layer analysis

机译：使用跨层分析分析HARQ对吞吐量和能源效率的影响

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This paper studies the potential improvements in terms of energy efficiency and system throughput of a hybrid automatic retransmission request (HARQ) mechanism. The analysis includes both the physical (PHY) and medium access (MAC) layers. We investigate the trade-off provided by HARQ, which demands reduced transmit power for a given target outage probability at the cost of more accesses to the channel. Since the competition for channel access at the MAC layer is very expensive in terms of energy and delay, our results show that HARQ leads to great performance improvements due to the decrease in the number of contending nodes - a consequence of the reduced required transmit power. Counter-intuitively, our analysis leads to the conclusion that retransmissions may decrease the delay, improving the system performance. Finally, we investigate the optimum values for the number of allowed retransmissions in order to maximize either the throughput or the energy efficiency.
机译：本文研究了混合自动重传请求（HARQ）机制在能源效率和系统吞吐量方面的潜在改进。分析包括物理（PHY）和媒体访问（MAC）层。我们研究了HARQ提供的折衷方案，该方案要求在给定目标中断概率下降低发射功率，但要增加对信道的访问。由于在能量和延迟方面，MAC层上的信道访问竞争非常昂贵，因此我们的结果表明，由于竞争节点数量的减少，HARQ导致了巨大的性能改进，这是所需发射功率降低的结果。与直觉相反，我们的分析得出这样的结论，即重传可以减少延迟，从而改善系统性能。最后，我们研究允许重传次数的最佳值，以使吞吐量或能量效率最大化。

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