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首页> 外文期刊>Journal of information science and engineering >Dynamic Slot Allocation in Restricted Access Window for IEEE 802.11ah Networks
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Dynamic Slot Allocation in Restricted Access Window for IEEE 802.11ah Networks

机译：IEEE 802.11ah网络受限访问窗口中的动态插槽分配

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摘要

The IEEE 802.11ah standard has been released to support machine-to-machine (M2M) communications among many sensor devices, which is rapidly increasing with the Internet of Things (IoT). The medium access control of 802.11ah introduces a restricted access window (RAW) into each beacon interval (BI). The RAW is further divided into many slots that allow only sensor devices to contend for transmission. This paper proposes a dynamic slot allocation scheme (DSAS) in the RAW of 802.11ah networks. To alleviate the contention in crowded M2M environments, the DSAS defines two sets of thresholds, high and low, to determine the sleeping-time level of a machine and the contention level for a slot, respectively. The innovative aspect of the DSAS is that machines with short sleeping time are allocated to less congested slots whereas machines with long sleeping time are allocated to more congested slots. To avoid unnecessary slot reallocation, machines with sleeping-time levels or contention levels between the high and low thresholds continue to use their original transmission contention slots. Simulations performed on ns3 show our proposed DSAS has significantly improved average backoff time and packet delay and increased the overall system throughput.
机译：IEEE 802.11ah标准已被释放到许多传感器设备之间支持机器到机器（M2M）通信，这与事物互联网（物联网）迅速增加。 802.11ah的介质访问控制将受限制的访问窗口（RAW）引入每个信标间隔（BI）。 RAW进一步分为许多槽，其仅允许传感器设备争辩传输。本文提出了802.11Ah网络的RAW中的动态插槽分配方案（DSA）。为了减轻拥挤的M2M环境中的争论，DSA分别定义了两组阈值，高低，分别确定机器的休眠时间级和槽的竞争级别。 DSA的创新方面是睡眠时间短的机器被分配到更少拥挤的槽，而睡眠时间长的机器被分配给更多拥挤的槽。为避免不必要的插槽重新分配，具有高低阈值和低阈值之间的休眠时间级别或争用级别的机器继续使用其原始传输争用插槽。在NS3上执行的模拟显示我们所提出的DSA显着提高了平均退避时间和数据包延迟并增加了整体系统吞吐量。

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