Patent ID: 8792470
Filing Date: 2014-07-29
Classification: H04B,H04W

Abstract:
1. A method for activating and maintaining a plurality of separate and distanced functional units in an aircraft cabin, in particular an emergency oxygen supply system for passengers of an aircraft, comprising the steps of: initializing a wireless network comprising a plurality of nodes, wherein each node is associated with a device, in particular a remotely operable device wherein said initializing comprises associating each node a sending time slot within a time frame using a TDMA synchronization scheme, wherein each node is active to send signals during its sending time slot and is active to receive signals during a first set of time slots comprising a number of time slots of said frame, wherein the sending time slot of a node is different from the sending time slots of at least a plurality of its neighbored nodes, wherein a neighbored node of a node is defined to be within a predetermined distance to said node, sending an activation signal from one of the nodes to at least the plurality of nodes in a predetermined neighborhood distance to said node, wherein each node after having received said activation signal transmits said activation signal during the sending time slot associated to said node to at least one neighbored node, wherein each node is associated at least one sending time slot, at least one listening time slot and a plurality of sleeping time slots and wherein after the initialization of the network the number of sleeping time slots is set to a calculated optimum number in an optimization process comprising the steps of: