Investigations on passive discovery schemes for IEEE 802.15.4 based Body Sensor Networks

2013 ◽  
Author(s):  
Saima Ali ◽  
Ehsan Tabatabaei Yazdi ◽  
Andreas Willig
Keyword(s):  
Sensor Networks ◽  
Ieee 802.15.4 ◽  
Body Sensor Networks

Body Sensors and Healthcare Monitoring

2012 ◽  
pp. 26-55
Author(s):  
Begonya Otal ◽  
Luis Alonso ◽  
Christos V. Verikoukis
Keyword(s):  
Energy Consumption ◽  
Sensor Networks ◽  
Ieee 802.15.4 ◽  
Body Sensor Networks ◽  
Mac Layer ◽  
Medical Systems ◽  
Battery Lifetime ◽  
Body Sensors ◽  
Healthcare Monitoring

The aging population and the high expectations towards quality of life in our society lead to the need of more efficient and affordable medical systems and monitoring solutions. The development of wireless Body Sensor Networks (BSNs) offers a platform to establish such a healthcare monitoring systems. However, BSNs in the healthcare domain operate under conflicting requirements. These are the maintenance of the desired reliability and message latency of data transmissions (i.e. quality of service), while simultaneously maximizing battery lifetime of individual body sensors. In doing so, the characteristics of the entire system, especially the Medium Access Control (MAC) layer, have to be considered. For this reason, this chapter aims for the optimization of the MAC layer by using energy-saving techniques for BSNs. The fact that the IEEE 802.15.4 MAC does not fully satisfy BSNs requirements highlights the need for the design of new scalable MAC solutions, which guarantee low-power consumption to the maximum number of body sensors in high density areas (i.e., in saturation conditions). In order to emphasize IEEE 802.15.4 MAC limitations, this chapter presents a detailed overview of this de facto standard for Wireless Sensor Networks (WSNs), which serves as a link for the introduction and description of the here proposed Distributed Queuing (DQ) MAC protocol for BSN scenarios. Within this framework, an extensive DQ MAC energy-consumption analysis in saturation conditions is presented to be able to evaluate its performance in relation to IEEE 802.5.4 MAC in highly dense BSNs. The obtained results show that the proposed scheme outperforms IEEE 802.15.4 MAC in average energy consumption per information bit, thus providing a better overall performance that scales appropriately to BSNs under high traffic conditions. These benefits are obtained by eliminating back-off periods and collisions in data packet transmissions, while minimizing the control overhead.

Hierarchical Wireless Networks of Body Sensor Networks for Healthcare Applications

2010 ◽  
pp. 65-86 ◽  
Author(s):  
José A. Afonso ◽  
Pedro Macedo ◽  
Luis A. Rocha ◽  
José H. Correia
Keyword(s):  
Sensor Networks ◽  
Ieee 802.15.4 ◽  
Base Station ◽  
Mac Protocols ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Body Sensor Networks ◽  
Healthcare Applications ◽  
Data Intensive ◽  
The One

Conventional wired body sensor networks have been used in hospitals over the last decade; however, the tethered operation restricts the mobility of the patients. In the scenario considered in this chapter, the signals collected from the patients’ bodies are wirelessly transmitted to a base station, and then delivered to a remote diagnosis centre through a communication infrastructure, enabling full mobility of the patient in the coverage area of the wireless network. Healthcare applications require the network to satisfy demanding requirements in terms of quality of service (QoS) and, at the same time, minimize the energy consumption of the sensor nodes. The traffic generated by data-intensive healthcare applications may lead to frequent collisions between sensor nodes and the consequent loss of data, if conventional MAC protocols for wireless sensor networks are used. Therefore, this chapter presents LPRT and CCMAC, two MAC protocols that intend to satisfy the QoS requirements of these applications, but differ in the wireless topology used. Experimental results for an implementation of the LPRT using an IEEE 802.15.4 compliant wireless sensor platform are presented, as well as simulation results comparing the performance of direct communication (between wireless body sensor nodes and the base station) with two other approaches relying on a cluster-based topology (similar to the one proposed by the authors of LEACH), which demonstrate the benefits of using a cluster-based topology on wireless healthcare applications.

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.

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