Interference mediation for coexistence of WLAN and ZigBee networks

Abstract

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.

Spectrum sharing methods for the coexistence of multiple RF systems: A survey

“…Both these technologies coexist in the ISM band, which creates a challenging coexistence environment for WPANs due to the power asymmetry. To address the coexistence problem, a Frame Converter (FC) system is developed in [140] A centralized spectrum sharing method is proposed in [141], in which an Interference Mediator (IM) is used to eliminate mutual interference between a WLAN and a ZigBee WPAN.…”

An Adaptive WLAN Interference Mitigation Scheme for ZigBee Sensor Networks

“…In [45], the signal strength within an area is measured for IEEE 802.11a/b/g/n while a method for determining the optimal sensor placement based on [45] was proposed, which led to a reduction in the number of sensors to cover the area in [46]. A proactive method mediating the interference of WLAN and ZigBee devices is proposed in [48], and another in [49], with the concept of fairness additionally considered. A coexistence algorithm enabling ZigBee links to exploit WLAN white is proposed in [50].…”

Coexistence of IEEE802.15.4 based networks: A survey

“…A similar approach was also reported in [27]. As illustrated in the column "Solution" of Table III, an important difference among center control TABLE III ON-DEMAND SOLUTIONS Source Solution Diversity [33] Center control, channel change on Network Frequency [6] Center control, channel change on Path Frequency [29] Center control, channel change on Group Frequency [27] Center control, channel change on Cluster Frequency [28] Distributed control Frequency [10] [24] Distributed control, MAC independent Frequency [30] Time interval control, Node-centric Time [36] Time interval control, Network-centric Time [13] Time interval control, MAC independent Time [35] Sending rate control Time [1] [25] Power control (propose) Space [23] Low-power devices provide power diversity Space [35] Power control Space [18] [21] CCA threshold control (propose) Space [38] CCA threshold control Space solutions is the scope of channel change when interference occurs. The scope of channel change in [33] …”

“…Time diversity solutions can be implemented by time interval control [30], [36], [13], which means different time intervals are used by different network devices (like a TDMA). Time diversity can also be implemented by traffic control [35].…”