Abstract
This paper considers a group of isolated heterogeneous Wireless sensor networks. Each isolated network consists of sensor nodes, a mobile sink and a commonly fixed base station (BS). Our work mainly focuses on how to minimize the energy consumption and reduce transmission delay during the data collection without negotiation on the consistency constraints of the networks. The randomly deployed sensor nodes are static and periodically send sensed data to their nearest nodes towards the mobile sink. The sensor nodes transfer their sensed data to the sink node via several intermediate nodes in the form of a tree. Here root node of the tree is considered as the sink that transfers aggregated data to the BS. Here network faces an additional problem called hot spot, where the nodes near to the BS have heavier data trac load and they consume more energy as compared to other nodes.
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