Patent ID: 9072114
Filing Date: 2015-06-30
Classification: H04L,H04W

Abstract:
1. A wireless sensor system comprising a plurality of network devices placed in a first network served by a first coordinator, one or more parameters of an entity being monitored by sensors of the associated network devices, sensor data being transmitted from the network devices in the first network to the first coordinator; detecting starting or ending of an emergency state with respect said entity by using the monitored parameters, the first coordinator arranged to perform non-beacon-mode communication with a first subset of the network devices transmitting sensor data to the first coordinator, and a second coordinator arranged to perform beacon-mode communication with a second subset of the devices transmitting sensor data to the second coordinator after a handover of communication responsibility in an emergency state, the system having means for determining which of the network devices to include in the first or second subsets in dependence upon whether the emergency state exists with respect to the devices.