Portable object detection systems and methods for mutual monitoring based on cooperation in a network including devices with asymmetric and constrained power capacities

A portable object detection system, the system comprising:

• a portable object;
• at least one small communication device (SCD) coupled with the portable object;
• a first cluster network including a first cluster head device (CHD), the first CHD comprising a smartphone, the first CHD configured to register the SCD prior to monitoring, and to execute mutual monitoring between the SCD and the first CHD;
• a detection server;
• and
• a second cluster network including a second CHD configured to register information about the SCD in the first cluster network prior to monitoring, wherein the second CHD comprises a family device registered prior to monitoring at the detection server through a request of the first CHD or the SCD in the first cluster network;
• wherein the detection server is configured to request monitoring of the SCD as a lost target in the first cluster network by the second CHD when a loss event is received from the first CHD in the first cluster network, the first CHD and the second CHD are managed at an adjustable message transmission interval sent from the first CHD to the SCD, and the adjustable message transmission interval sent from the first CHD to the SCD is modified by at least one of a local timestamp, a next wakeup timestamp, a sync timestamp, a location information, a mobility, and a power capacity of the SCD and the first CHD as collected by the mutual monitoring.