| CPC H04W 52/0216 (2013.01) [H04W 52/0277 (2013.01); Y02D 30/70 (2020.08)] | 20 Claims |
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1. A method comprising:
determining by a first node in a communications network,
a listening schedule to be used by the first node, wherein the listening schedule is based upon timing information received from a plurality of nodes in the communication network, and wherein the first node combines the timing information received from the plurality of nodes to adjust the timing information of the first node, wherein determining the listening schedule comprises weighting the timing information received from the plurality of nodes;
the listening schedule of the first node is a selection of a time slot from within a frame length comprising a first number of time slots;
determining by the second node, a listening schedule to be used by the second node, the listening schedule of the second node is a selection of a time slot from within a frame length comprising a second number of time slots;
the first node receiving a synchronizing time signal from a plurality of other nodes, the first node averaging the received synchronizing time signals and adjusting its own timing signal to correspond to the averaged synchronizing time signal;
the first node communicating its listening schedule to the second node; and
the second node broadcasting a message to the first node at a time corresponding to the listening schedule transmitted by the first node to the second node, the broadcast message comprising sensor information from the second node representing an evacuation condition and a location of the second node.
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