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A method for performing registration in a low-power device (LPD) to a wireless network, the method comprising: broadcasting (705) a first uplink UL message indicating a registration request, the message including the ID of the LPD in the wireless network; receiving (710) an acknowledgment from at least one communication node, the acknowledgment including the node ID of the communication node that received the first UL message; and determining (715) an initial network topology based on the acknowledgment.