School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology (GIST), 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea.
Samsung Electronics, Suwon 16677, Korea.
Sensors (Basel). 2021 Apr 12;21(8):2706. doi: 10.3390/s21082706.
In wireless local area networks (WLANs), the effect of interference signals between neighboring nodes increases as the number of wireless nodes using limited radio frequency resources in a limited space increases, which can significantly degrade the reliability of data transmission. In high-density WLANs, there can be several neighboring access points (APs) that can receive uplink transmission from a station. In conventional medium access control (MAC) protocols, uplink data frames containing errors or transmitted from a non-associated station are discarded at APs. Alternatively, we propose a MAC protocol using redundant wireless links between neighboring APs and the non-associated stations. In the proposed MAC protocol, we consider a centralized WLAN with a control node that performs error corrections of erroneous uplink data frames via a majority voting algorithm-based link-layer diversity scheme using uplink data received from multiple APs to increase the reliability of data transmission. In addition, we propose an adaptive carrier sensing ranging mechanism to improve the uplink network throughput in the proposed centralized WLAN system. Further, we conduct simulation studies and software-defined radio-based experiments to evaluate the performance of the proposed MAC protocol in various WLAN scenarios.
在无线局域网 (WLAN) 中，随着使用有限射频资源的无线节点数量的增加，相邻节点之间的干扰信号的影响也会增加，这会显著降低数据传输的可靠性。在高密度 WLAN 中，可能有几个相邻的接入点 (AP) 可以接收来自站点的上行链路传输。在传统的介质访问控制 (MAC) 协议中，包含错误的上行链路数据帧或从非关联站点发送的数据帧将在 AP 处丢弃。或者，我们提出了一种使用相邻 AP 与非关联站点之间的冗余无线链路的 MAC 协议。在提出的 MAC 协议中，我们考虑了一个集中式 WLAN，其中有一个控制节点，该节点通过基于多数投票算法的链路层分集方案来执行错误上行链路数据帧的纠错，该方案使用从多个 AP 接收的上行链路数据来提高数据传输的可靠性。此外，我们提出了一种自适应载波侦听测距机制，以提高集中式 WLAN 系统中的上行链路网络吞吐量。此外，我们进行了仿真研究和基于软件定义无线电的实验，以评估所提出的 MAC 协议在各种 WLAN 场景下的性能。
