METHOD FOR REASSIGNING THE ROLE OF A WIRELESS NODE IN A WIRELESS NETWORK

摘要

The invention is a method for maintaining network lifetime of a wireless network in wireless communication system said network comprising a plurality of device nodes (A C Q N ). Selected ones of the wireless nodes (A B C) have assigned roles (1 2 3 GW) in the wireless network. To improve and maintain network lifetime the method comprises determining (4 14 24) a below threshold operating condition of a first sensor node (A) assigned to a first role (1) and re assigning (5 19 29) the first role to another second node (Q) in said network. In other aspects of the invention a method system and a computer program for carrying out the method are described.