Adaptive channel utilisation in IEEE 802.15.4 wireless body sensor networks: Continuous hopping approach

2014 ◽  
Author(s):  
Amirhossein Moravejosharieh ◽  
Ehsan Tabatabaei Yazdi ◽  
Andreas Willig ◽  
Krzysztof Pawlikowski
Keyword(s):  
Sensor Networks ◽  
Ieee 802.15.4 ◽  
Body Sensor Networks ◽  
Wireless Body Sensor Networks

scholarly journals Performance Evaluation of IEEE 802.15.4-based Wireless Body Sensor Networks: An Experimental Study

2017 ◽  
Vol 3 (1) ◽  
pp. 15-27 ◽  
Author(s):  
Amir Hossein Moravejosharieh
Keyword(s):  
Sensor Networks ◽  
Performance Measures ◽  
Ieee 802.15.4 ◽  
Mutual Interference ◽  
Phase Shifting ◽  
Body Sensor Networks ◽  
Dynamic Phase ◽  
Significant Performance ◽  
Ieee 802.15.4 Standard ◽  
Wireless Body Sensor Networks

One of the most challenging issues in IEEE 802.15.4-based Wireless Body Sensor Networks (WBSNs) is the mutual interference caused by neighbouring WBSNs. As the number of co-located such sensor networks becomes larger in a frequency channel, the destructive impact of mutual interference becomes stronger and eventually causes significant performance degradation mainly due to inefficient channel utilisation. In this paper, we have proposed a new scheme called “dynamic-phase-shifting” in which a WBSN is able to shift its beacon packets to other phases (time slot) to eventually find a phase with reasonably higher performance gain. A set of performance measures along with two experimental scenarios are used to evaluate the performance of dynamic-phase shifting scheme compared to a baseline scheme that follows IEEE 802.15.4 protocol standard.  The obtained results show that dynamic-phase-shifting scheme is not only feasible to be implemented on real sensor devices but also, it outperforms IEEE 802.15.4 standard in terms of the considered performance measures.

scholarly journals Frequency-Adaptive Approach In IEEE 802.15.4 Wireless Body Sensor Networks: Continuous-Assessment or Periodic-Assessment?

2015 ◽  
Vol 1 (1) ◽  
pp. 19-34 ◽  
Author(s):  
Amir Hossein Moravejosharieh
Keyword(s):  
Sensor Networks ◽  
Ieee 802.15.4 ◽  
Low Cost ◽  
Body Sensor Networks ◽  
Continuous Assessment ◽  
Satisfaction Rate ◽  
Negative Impacts ◽  
Wireless Body Sensor Networks ◽  
Initial Choice ◽  
Adaptive Approaches

IEEE 802.15.4 is arguably considered as a welldesigned standard protocol to address the need for low-rate, low-power and low-cost Wireless Body Sensor Networks (WBSNs).Within a WBSN, Node‘s communication occurs during theirconfined active periods. The increase in number of active WBSNswould consequently result in the elevation of the overlapping ratiobetween the active periods of neighbouring WBSNs. In this paper,we address the interference caused by neighbouring WBSNsand its devastating consequences. Additionally, two frequencyadaptive approaches are proposed as the solutions for decreasingthe negative impacts of internal intereference. Frequency hoppingcould be considered as a possible approach to alleviate theWBSNs performance degradation due to such interference. Inthat regard, two frequency-adaptive approaches are proposednamely: “Continuous-Assessment” and “Periodic-Assessment”schemes and are compared with previously introduced “Initial-Choice” and “Blind-Choice” schemes in terms of channel util-isation, success rate, Satisfaction rate and energy consumption(both sensors and coordinator). Eventually, it is concluded thatContinuous-Assessment scheme outperforms the other introducedschemes in terms of above-mentioned performance measures.

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