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arXiv 2008.02697cs.NI
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时钟漂移对IEEE 802.11 ax/ah网络目标唤醒时间的影响

Clock Drift Impact on Target Wake Time in IEEE 802.11ax/ah Networks

Dmitry Bankov, Evgeny Khorov, Andrey Lyakhov, Ekaterina Stepanova

摘要:

在物联网场景中,提供低能耗的客户端设备至关重要。为了应对这一挑战,新的Wi-Fi标准引入了目标唤醒时间(TWT)机制。使用TWT,设备根据计划传输数据,然后进入休眠状态。这种机制的主要问题是时钟漂移现象,由于该现象,设备不再严格遵守时间表。因此,它们可能错过预定的传输时间,这增加了活动时间,从而增加了功耗。本文研究了两种不同行波管工作模式下的上行链路传输。在第一种模式下,传感器在唤醒后使用随机信道接入向接入点(AP)发送分组。在第二种模式下,AP轮询站点,并且站点只能在从AP接收到触发帧之后才能发送数据包。针对这两种模式,研究了不同行波管参数对平均传输时间、丢包率和平均能量消耗的影响。结果表明,当被配置为保证给定的分组丢失率时,第一模式提供较低的传输时间,而第二模式提供较低的能耗。

英文摘要:

In the Internet of Things scenarios, it is crucially important to provide low energy consumption of client devices. To address this challenge, new Wi-Fi standards introduce the Target Wake Time (TWT) mechanism. With TWT, devices transmit their data according to a schedule and move to the doze state afterwards. The main problem of this mechanism is the clock drift phenomenon, because of which the devices cease to strictly comply with the schedule. As a result, they can miss the scheduled transmission time, which increases active time and thus power consumption. The paper investigates uplink transmission with two different TWT operation modes. With the first mode, a sensor transmits a packet to the access point (AP) after waking up, using the random channel access. With the second mode, the AP polls stations and they can transmit a packet only after receiving a trigger frame from the AP. For both modes, the paper studies how the average transmission time, the packet loss rate and the average energy consumption depend on the different TWT parameters. It is shown that when configured to guarantee the given packet loss rate, the first mode provides lower transmission time, while the second mode provides lower energy consumption.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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