Abstract: Due to energy limitation, wireless sensor networks are limited in life span. Therefore power consumption control has been a hot topic. In belt-shaped topology, relay nodes close to the sink must forward more data than those far from the sink. They inevitably consume more energy, therefore are exhausted quickly and become a bottleneck of the network. This paper aims to improve a radio range adjustment algorithm to increase lifespan of the bottlenecked nodes by ensuring network connectivity for uplink traffic and acceptance for downlink traffic.

Key words: power control, wireless link unidirectivity, wireless sensor network