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arXiv 2202.08646cs.ITmath.IT
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衰落信道上的实时通信

On-Time Communications Over Fading Channels

Yan Li, Yunquan Dong, Byonghyo Shim

摘要:

我们考虑在衰落信道上的一系列数据包的准时传输,与传统的准时通信不同,我们研究了有多少数据包可以被$δ$准时接收,这意味着数据包的接收偏差不大于$δ$时隙。在这个框架中,我们首先推导出在衰落信道上的随机传输的准时接收率时,没有使用控制。为了提高准时接收率,我们进一步建议通过延迟,丢弃或重复数据包来调度传输。具体来说,我们在衰落信道上的调度建模为马尔可夫决策过程(MDP),然后使用一个有效的迭代算法获得最优的调度策略。对于一个给定的分组传输序列,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的增加而减小(到零),通过使用最优分组调度,准时接收率收敛到一个更大的常数。此外,我们表明,如果目标接收间隔和/或偏差容限$δ$增加,或衰落信道的随机性降低,准时接收率增加。

英文摘要:

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.

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