Coupling power and frequency adaptation for interference mitigation in IEEE 802.15.4-based mobile body sensor networks: Part II

One of the crucial issues with IEEE 802.15.4-based wireless body sensor networks operating in the unlicensed 2.4 GHz band is to maintain reliable transmission while being subjected to external interference (i.e. WiFi). One approach to mitigate this problem is to enable body sensor networks to adaptively change their current frequency channel and to change the transmit-power in response to the observed interference variations. In previous work we have considered these two mechanisms separately for high interference scenarios. In this paper we have considered the impact of varying data rates, interferer densities and traffic intensities on the performance measures for low to medium interference scenarios. Furthermore, we present a new scheme that joints transmit-power with frequency adaptation. The schemes are evaluated and presented for different scenarios.