Development and field experiment of wide area Wi-SUN system based on IEEE 802.15.4g

This paper proposes and develops a wide area wireless smart utility network (Wi-SUN) system and measures the transmission performance of the system by field experiments. In the wide area Wi-SUN system, a high performance base station (BS) can expand the direct communication distance to wireless devices with sensors and meters by enriching BS functions, i.e. in the down link (DL), transmission power is enlarged, and in the up link (UL), high gain directional antennas are used. Field experiments of the system are carried out to validate effectiveness and availability of the proposed system. The experimental systems are compliant with the regulation for Japan, namely transmission powers of BS and devices are 250 mW and 20 mW respectively, modulation scheme is Gaussian frequency shift keying (GFSK) and the operational frequency band is 920 MHz. Experimental results show that the proposed system expand the direct communication distance around 4.33 times longer than that of conventional system in the practical urban environment.