An Adaptive WLAN Interference Mitigation Scheme for ZigBee Sensor Networks

Abstract

We propose an adaptive interference avoidance scheme that enhances the performance of ZigBee networks by adapting ZigBees' transmissions to measured wireless local area network (WLAN) interference. Our proposed algorithm is based on a stochastic analysis of ZigBee operation that is interfered with by WLAN transmission, given ZigBee and WLAN channels are overlaid in the industrial, scientific, and medical (ISM) band. We assume that WLAN devices have higher transmission power than ZigBee devices. Then, the high transmission power of WLAN devices causes the capture effect when WLAN and ZigBee transmit simultaneously. On the other hand, ZigBee performs backoff during clear channel assessment (CCA) operation if the WLAN is transmitting its frames on the channel. We adopt a widely used WLAN queueing/transmission model that is based on a Markov chain concept. We model a ZigBee device's operation using the Markov chain that includes WLAN interference statistically derived from the WLAN queueing/transmission model. Our proposed algorithm is evaluated in a simulated ZigBee network in the presence of varying WLAN interference. Numerical results show that our WLAN interference mitigation scheme finds the ZigBee control parameters, among a candidate set, which enhances ZigBee network performance compared to the conventional ZigBee operation.

Runtime Estimation of the Number of Active Devices in IEEE 802.15.4 Slotted CSMA/CA Networks with Deferred Transmission and No Acknowledgment Using ARMA Filters

“…The discrete time Markov chain (DTMC) models to analyze the IEEE 802.15.4 have been studied in [11][12][13][14][15]. Park et al [11] analyzed the throughput and energy consumption under saturated condition and validated their analysis through comparison with simulations.…”

“…Lee et al [14] presented an additional carrier sensing (ACS) algorithm for IEEE 802.15.4 WSNs which gives the node one more chance that performs CCA if and only if the second CCA of the device is busy. Chong et al [15] analyzed the performance of throughput and energy consumption of ZigBee sensor networks under wireless local area network (WLAN) interference. However, in [12,14,15], the deferred Wireless Communications and Mobile Computing transmission has not been considered when the remaining slots are not enough to transmit a frame.…”

“…Chong et al [15] analyzed the performance of throughput and energy consumption of ZigBee sensor networks under wireless local area network (WLAN) interference. However, in [12,14,15], the deferred Wireless Communications and Mobile Computing transmission has not been considered when the remaining slots are not enough to transmit a frame. Jung et al [13] analyzed throughput of the slotted CSMA/CA for IEEE 802.15.4 with considering deferred transmission that occurs when the remaining slots are not enough to transmit a frame and validated the model through simulations.…”

“…where is the probability that a device performs the first CCA when the device is in the backoff procedure [11,15] and is the number of active devices. Then, from (1), we can calculate as…”

Data Mining for Interference Avoidance in Smart Cities Iot Networks

“…The interference avoidance in the frequency domain is also attractive. The most of the research is focused on ZigBee devices and its channel adjustment [19]- [23], but recently [24] proposed that both ZigBee and WiFi change operating frequency.…”