Abstract: An method for forming wireless communications groups applied in a wireless communications system includes selecting g coordinators from n wireless communications devices around a base station, allocating remaining (n?g) wireless communications devices of the n wireless communications devices to the g coordinators to form g wireless communications groups, reselecting a coordinator from each wireless communications group to generate g updated coordinators, and allocating remaining (n?g) wireless communications devices of the n wireless communications devices to the g updated coordinators to form g updated wireless communications groups.

Abstract: An method for forming wireless communications groups applied in a wireless communications system includes selecting g coordinators from n wireless communications devices around a base station, allocating remaining (n-g) wireless communications devices of the n wireless communications devices to the g coordinators to form g wireless communications groups, reselecting a coordinator from each wireless communications group to generate g updated coordinators, and allocating remaining (n-g) wireless communications devices of the n wireless communications devices to the g updated coordinators to form g updated wireless communications groups.

Abstract: A slot device has a slot, a determining circuit, and a warning device. The slot is used to install an expansion card. The determining circuit is coupled to the slot and is used to determine whether the expansion card is completely installed to the slot. The warning device is coupled to the determining circuit, and when the determining circuit determines that the expansion card is not completely installed to the slot, the determining circuit controls the warning device to send out a warning signal.