Dynamic channel access scheme for interference mitigation in relay-assisted intra-WBANs

Abstract

International audience—This work addresses problems related to interference mitigation in a single wireless body area network (WBAN). In this paper, We propose a distributed Combined carrier sense multiple access with collision avoidance (CSMA/CA) with Flexible time division multiple access (TDMA) scheme for Interference Mitigation in relay-assisted intra-WBAN, namely, CFTIM. In CFTIM scheme, non interfering sources (transmitters) use CSMA/CA to communicate with relays. Whilst, high interfering sources and best relays use flexible TDMA to communicate with coordinator (C) through using stable channels. Simulation results of the proposed scheme are compared to other schemes and consequently CFTIM scheme outperforms in all cases. These results prove that the proposed scheme mitigates interference, extends WBAN energy lifetime and improves the throughput. To further reduce the interference level, we analytically show that the outage probability can be effectively reduced to the minimal

Adaptive Parameters Adjustment in WBAN based IEEE 802.15.4 Protocol to Mitigate Wi-Fi Interferences

“…Another point to be improved in our adaptive algorithm is that the detection of transmission failure is not restricted to the non-reception of ACK packet after sending the packet, but also it is due to the channel access failures. Studies in [26] propose a new estimator consisting of merging the Clear Channel Assessment count with the Packet Reception Rate. Results show that this distinguishes persistent IEEE 802.11 bgn traffic more robustly.…”

“…Researchers were interested in studying the WBAN communication quality under interferences. Many works [1], [2], [3] showed that interferences decreased the reliability of packet reception, increased transmission delay and consumed more energy. Data losses caused by interferences disrupt the correct operation of time-constrained WBAN applications; especially, in medical applications, it disrupts the delivery of critical data (like heart beat measurements) to the concerned server and provokes delayed reception.…”