论文标题
通过褪色渠道的准时通信
On-Time Communications Over Fading Channels
论文作者
论文摘要
我们考虑了一系列数据包在褪色通道上的按时传输。与传统的计时通信不同，我们调查了可以在$Δ$中收到多少数据包，这意味着该数据包的偏差不得大于$Δ$插槽。在此框架中，我们首先在未使用控制时首先得出褪色通道上随机传输的准时接收率。为了提高按时接收率，我们进一步建议通过延迟，掉落或重复数据包来安排传输。具体而言，我们将淡入淡出通道的调度范围建模为马尔可夫决策过程（MDP），然后使用有效的迭代算法获得最佳的调度策略。对于给定的数据包传输序列，我们分析了随机传输和最佳调度的准时接收率。我们的分析和仿真结果表明，随机传输的准时接收率随序列长度而降低（零）。通过使用最佳数据包调度，按时接收率会收敛到更大的常数。此外，我们表明，如果目标接收间隔和/或偏差公差$δ$增加，或者逐渐减少了偏差$δ$，则按时接收率会增加。
We consider the on-time transmissions of a sequence of packets over a fading channel.Different from traditional in-time communications, we investigate how many packets can be received $δ$-on-time, meaning that the packet is received with a deviation no larger than $δ$ slots. In this framework, we first derive the on-time reception rate of the random transmissions over the fading channel when no controlling is used. To improve the on-time reception rate, we further propose to schedule the transmissions by delaying, dropping, or repeating the packets. Specifically, we model the scheduling over the fading channel as a Markov decision process (MDP) and then obtain the optimal scheduling policy using an efficient iterative algorithm. For a given sequence of packet transmissions, we analyze the on-time reception rate for the random transmissions and the optimal scheduling. Our analytical and simulation results show that the on-time reception rate of random transmissions decreases (to zero) with the sequence length.By using the optimal packet scheduling, the on-time reception rate converges to a much larger constant. Moreover, we show that the on-time reception rate increases if the target reception interval and/or the deviation tolerance $δ$ is increased, or the randomness of the fading channel is reduced.
