We study transmission delay minimization of a wireless powered communication (WPC) system in a point-to-point scenario with one hybrid access point (HAP) and one WPC node. In this type of communications, the HAP sends energy to the node at the downlink (DL) for a given time duration and the WPC node harvests enough radio frequency (RF) power. Then, at the uplink (UL) channel, the WPC node transmits its collected data in a given time duration to the HAP. Minimizing such round trip delay is our concern here. So, we have defined four optimization problems to minimize this delay by applying the optimal DL and UL time durations and also the optimal power at the HAP. These optimization problems are investigated here with thorough comparison of the obtained results. After that, we extend our study to the multiuser case with one HAP and $K$ nodes and two different optimization problems are studied again in these cases.
翻译：我们研究在一个混合接入点和一个WPC节点的点对点假设中最大限度地减少无线动力通信系统的传输延迟。在这种通信中,HAP在一定的时间内将能量输送到下行节点(DL),WPC节点捕捉到足够的无线电频率。然后,在上行节点(UL)频道,WPC节点在一定的时间内将其收集的数据传送给HAP。尽量减少这种往返飞行延迟是我们这里关注的问题。因此,我们确定了四个优化问题,通过应用最佳DL和UL时间期限以及HAP的最佳能力,最大限度地减少这种延迟。在这里对这些优化问题进行了调查,对所获得的结果进行了彻底比较。之后,我们又将研究扩大到多用户案件,即一个HAP和1K美元节点,并在这些案件中再次研究两个不同的优化问题。
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