%0 Journal Article %A Malka N. Halgamuge and Toong-Khuan Chan and Priyan Mendis %D 2009 %J International Journal of Civil and Environmental Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 28, 2009 %T Improving Multi-storey Building Sensor Network with an External Hub %U https://publications.waset.org/pdf/6784 %V 28 %X Monitoring and automatic control of building environment is a crucial application of Wireless Sensor Network (WSN) in which maximizing network lifetime is a key challenge. Previous research into the performance of a network in a building environment has been concerned with radio propagation within a single floor. We investigate the link quality distribution to obtain full coverage of signal strength in a four-storey building environment, experimentally. Our results indicate that the transitional region is of particular concern in wireless sensor network since it accommodates high variance unreliable links. The transitional region in a multi-storey building is mainly due to the presence of reinforced concrete slabs at each storey and the fac┬©ade which obstructs the radio signal and introduces an additional absorption term to the path loss. %P 202 - 205