A wireless communication device, serving as a destination node of one or more data packets propagated in a wireless mesh network, is provided. The wireless communication device includes a wireless transceiver and a controller. The wireless transceiver performs wireless transmission and reception in the wireless mesh network. The controller selects a first relay node to serve as a friend node for the wireless communication device and to store the data packets which arrive when the wireless communication device operates in a sleep mode, and broadcast, via the wireless transceiver, a notification message in the wireless mesh network when selecting a second relay node to serve as the friend node for the wireless communication device.
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