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Recently, 802.11ah network has been widely used to support up to 8,192 nodes to serve various Internet of Things (IoT) communication applications. Because of the large number of nodes, it introduces a group-based MAC protocol, which divides nodes into groups to alleviate the hidden node problem. However, hundreds or even thousands of nodes are assigned into a group to contend the shared wireless channel. As a result, the problem is still serious and it causes a serious decline in systemdoi:10.1109/access.2019.2954822 fatcat:awqwc2wdtfakzmwcb2geo525zm