y 2) Interference Mediation Part N N II. INTERFERENCE MEDIATION SCHEME FOR COLLOCATED ZIGBEE AND WLAN NETWORKSIn this paper, we propose a proactive and network-centric interference mediation scheme in an overlaid network environment of WLAN and ZigBee devices. In order to solve this problem, we propose fairness-based TDMA schemes to guarantee the ZigBee data transmission. y Fig. 1. Block Diagram of the Proposed Interference Mediation Scheme Zigbee channel observation using FER 1) Channel Status Observation Part WLAN channel observation using WLAN Dev.To mediate this inter-system interference, we propose an interference mediation scheme in which an interference mediator(IM) coordinates the interference between WLAN and Zig-Bee networks using its internal WLAN and ZigBee modules. This 1M plays an important role as a coordinator of mutual interference mediation between a ZigBee piconet and a WLAN BSS. Fig. 1 shows a block diagram of the proposed interference mediation scheme which consists of a Channel Status Observation Part and an Interference Mediation Part.Abstract-In emerging ubiquitous wireless environments, mobile devices can have multiple communication modules such as WLAN and ZigBee. Since IEEE802.15.4 ZigBee devices and IEEE802.11b WLAN devices share the same 2.4GHz ISM band, a ZigBee network operating in a low power environment can be severely interfered by overlapped WLAN networks with much larger bandwidth due to higher transmission power. To overcome this inter-system interference problem and guarantee the ZigBee communications, we propose an interference mediation scheme in an overlaid network environment of WLAN and ZigBee devices by using an interference mediator, and evaluate the performance of ZigBee and WLAN networks for three different resource allocation schemes in terms of throughput and channel occupancy time.
Nitrogen-functionalisation of chemically driven graphene (CDG) thin films effectively reduced the ROS generated from cells on the f-CDG films. The results indicate that N2plasma treatment of CDG is very useful in improving biocompatibility for the bio-application of graphene materials.
In this paper, we analyze the operation of ZigBee devices under the presence of Bluetooth interference and formulate a mathematical model for evaluating the performance of ZigBee devices. Our proposed mathematical model for ZigBee devices is based on a Markov chain concept. We here consider Bluetooth devices which adopt class 1 or class 2 Bluetooth chips as an interference source and the transmission power of Bluetooth devices is set several to hundred times higher than that of ZigBee devices. Thus, we assume Bluetooth devices interfere with ZigBee devices, but the ZigBee devices do not. The throughput and energy consumption of ZigBee devices in a ZigBee network are derived for varying the number of actively interfering Bluetooth devices. The result shows that analytical results obtained from the mathematical model agree well with simulation results.
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