No abstract

Health monitoring technologies such as Body Area Network (BAN) systems has gathered a lot of attention during the past few years. Largely encouraged by the rapid increase in the cost of healthcare services and driven by the latest technological advances in Micro-Electro-Mechanical Systems (MEMS) and wireless communications. BAN technology comprises of a network of body worn or implanted sensors that continuously capture and measure the vital parameters such as heart rate, blood pressure, glucose levels and movement. The collected data must be transferred to a local base station in order to be further processed. Thus, wireless connectivity plays a vital role in such systems. However, wireless connectivity comes at a cost of increased power usage, mainly due to the high energy consumption during data transmission. Unfortunately, battery-operated devices are unable to operate for ultra-long duration of time and are expected to be recharged or replaced once they run out of energy. This is not a simple task especially in the case of implanted devices such as pacemakers. Therefore, prolonging the network lifetime in BAN systems is one of the greatest challenges. In order to achieve this goal, BAN systems take advantage of low-power in-body and on-body/off-body wireless communication technologies. This paper compares some of the existing and emerging lowpower communication protocols that can potentially be employed to support the rapid development and deployment of BAN systems.

No abstract

This paper presents the exploration of novel mechanisms toward providing Quality of Service (QoS) guarantees in mobile ad hoc networks. We study mechanisms that provide differentiated services to packets of varying priority traffic flows. These mechanisms do not require any central coordination and do not depend on any specific protocols at the physical, MAC, or network layers. Nodes independently monitor the rates of the highest priority flows and signal corrective mechanisms when these rates fall outside of specified local bounds. Triggering conditions for network-wide corrective mechanisms are designed to trade-off rapid reactive response to local QoS violations with control packet overhead. A range of corrective mechanisms are explored that attempt to maintain reactive response while improving total network utilization, including resources consumed by lower priority traffic. We provide simulation results that demonstrate the effectiveness of monitoring, reactive triggering, and basic and advanced corrective mechanisms. We discuss the extension of these novel mechanisms to a complete QoS solution for mobile ad hoc networks.

The optimized link state routing (OLSR) protocol is a proactive routing protocol for Wireless Mobile Adhoc Networks. This protocol is considered to be efficient for large and dense networks. Ad-hoc wireless sensor networks are a subset of mobile adhoc networks with limited resources. In this paper simulation results of using OLSR for wireless sensor network comprising of both the static and the mobile nodes has been analysed. For simulation purpose QualNet5.0 has been used as the tool.