Improving network throughput in 60GHz WLANs via multi-AP diversity
Improving network throughput in 60GHz WLANs via multi-AP diversity
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DOI：
10.1109/icc.2012.6364506
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
Xu Zhang;Sheng Zhou;Xiaolei Wang;Z. Niu;Xiaokang Lin;Dalin Zhu;M. Lei
中科院分区：
文献类型：
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作者：
Xu Zhang;Sheng Zhou;Xiaolei Wang;Z. Niu;Xiaokang Lin;Dalin Zhu;M. Lei
由于毫米波信号的衍射能力有限，解决60GHz无线局域网中的阻塞问题是主要挑战之一。由于多个接入点（AP）通常采用在室内环境中，以确保覆盖范围，并满足日益增长的需求，极高的数据速率的应用程序，在本文中，我们提出了一个多AP架构与MAC层设备称为接入控制器（AC），使每个站关联和多个AP合作。通过这种方式，可以利用多AP多样性来解决阻塞问题。由于AP可能无法完全获得信道的状态，我们制定的AP选择问题作为一个部分观测马尔可夫决策过程（POMDP），并获得一个最佳的政策。此外，开发了一种基于阈值的策略，降低了复杂性，该策略仅取决于连续传输失败的数量来决定AP的选择。最佳阈值AP选择也推导出来。仿真结果表明，基于阈值的策略达到几乎相同的性能从POMDP的最优策略。
Due to the limited diffracting ability of millimeter wave (mm-wave) signals, solving the blockage problem in 60GHz WLANs is one of major challenges. Since multiple access points (AP) are typically employed in the indoor environment to ensure the coverage and to meet the increasing demand for extremely high data rate applications, in this paper, we propose a multi-AP architecture with which a MAC layer device called an Access Controller (AC) is employed to enable each station to associate and cooperate with multiple APs. In this way, multi-AP diversity can be exploited to solve the blockage problem. Since APs may not fully obtain the state of channels, we formulate the AP selection problem as a Partially Observed Markov Decision Process (POMDP) and obtain an optimal policy. Moreover, a threshold-based policy with reduced complexity is developed with which the decision for AP selection depends only on the number of consecutive transmission failures. The optimal threshold value for AP selection is also derived. Simulation results show that the threshold-based policy achieves almost the same performance as the optimal policy derived from POMDP.