Distributed interference management in medical wireless sensor networks

Wireless communications are confronted to different kinds of interferences. Such interference has significant impact on the reliability of packet transmissions. Due to very low power communication, wireless body area networks are potentially susceptible to interfere with coexisting wireless systems, including other WBANs that might exist in their vicinity. We employ cognitive radios (CRs) for proactive interference sensing in such systems. Our approach insures the channel quality evaluation reducing the packet loss rate and mitigate interferences. On one hand, the intra-WBAN interference is managed through FTDMA protocol. On the other hand, if a high intensity of interference is detected, this solution allows switching channel transmission, thereby ensuring the coexistence of WBANs. Moreover, we modeled the functioning of this method using the Markov's chains in continuous time. The Transmission error rate is introduced as a measure to quantify the effectiveness of the proposed schemes.

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