Two-Hop Routing with Traffic-Differentiation for QoS Guarantee in Wireless Sensor Networks

This paper proposes a Traffic-Differentiated Two-Hop Routing protocol for Quality of Service (QoS) in Wireless Sensor Networks (WSNs). It targets WSN applications having different types of data traffic with several priorities. The protocol achieves to increase Packet Reception Ratio (PRR) and reduce end-to-end delay while considering multi-queue priority policy, two-hop neighborhood information, link reliability and power efficiency. The protocol is modular and utilizes effective methods for estimating the link metrics. Numerical results show that the proposed protocol is a feasible solution to addresses QoS service differenti- ation for traffic with different priorities.Comment: 13 page

Energy aware power save mode management in wireless mesh networks

In recent times Wireless Mesh Networks (WMN) have evolved as powerful networks for most commercial applications. Many contributions have been made to enhance the performance of WMN of which the enhancement of the network lifetime remains as one of the challenging area for research. IEEE standard proposed an amendment which introduced Power Save Mode (PSM) in order to increase the lifetime of WMN. It has three modes such as Active, Light Sleep and Deep Sleep. There exist a lot of literature on increasing energy efficiency by keeping node in Deep Sleep mode when it is not involved in transmission. But current Power Save Mode has some deficiency in low Packet Delivery Ratio (PDR). This paper presents Energy Aware Power Save Mode (EAPSM) which attempt to overcome the deficiency of low PDR by triggering PSM. EAPSM consist of three modules namely, remaining energy calculator, transmission mode identifier and PSM scheduler. EAPSM schedules PSM based on the constraints such as remaining energy of a node and its participation in transmission. The proposed method includes mathematical model and algorithms which gives improved performance over conventional PSM

Minimum battery draining rate aware optimized link state routing in wireless mesh network

Wireless mesh network is a flexible, low cost and multi-purpose networking platform with wired infrastructure connected to the internet. In WMN nodes often have a limited battery supply to use for the sending and reception of transmissions. Routing protocols over WMN are an important issue and many proposals have been addressed to efficiently manage topology information, to offer network scalability and to prolong network lifetime. Optimized Link State Routing (OLSR) is a proactive type of routing which presents the advantage of finding a route between two nodes in the network in a very short time. It can consume lot of energy resources in selecting the Multi-point Relays (MPRs) and exchanging Topology Control information. To overcome this, we present a mechanisms for the OLSR routing protocol to improve its energy performance in Wireless Mesh Networks. We propose a Minimum Battery Draining Rate Aware (MDRA-OLSR) algorithm which utilizes the information collected by OLSR at every node in providing better network connectivity. We propose a modification in the MPR selection mechanism of OLSR protocol, based on the Willingness concept, in order to increase the network lifetime without losses of performance such as PDR, throughput etc. We consider both available energy and battery draining rate metric as a key criteria to select MPR in a set of MPRs. A comparison of an OLSR and MDRA-OLSR protocol is performed. The experiments are simulated using NS3 simulator by considering various situations such as changing speed of nodes, data rate and packet size by keeping the nodes position static and moving nodes dynamically. In this paper, we present the related works on utilization of energy as metric in routing, proposed model, simulation and discussions of the model in Wireless Mesh Networks

Remote monitoring and discrete data capture of joint pain and other parameters via the NokiaN900 device: Enhancing patient/physician interaction

The new generation cellular phones have multi-functional capabilities such as imaging, video, audio recording and messaging in addition to providing internet access. In this paper we present an innovative application in the field of remote health monitoring using N900 Nokia tablet, which will serve as a communicating device between the patient and healthcare providers like doctors and nurses. Patients with arthritis require regular objective monitoring of their affected joints by healthcare providers requiring that patients report their subjective pain levels to their physicians. The application has a patient's module allowing the patient to select their pain level on a sliding scale from a graphical representation of various human joints and send this as an SMS to the doctor. The healthcare providers can review the pain level, save it to a database and make an informed decision about possible recommendations based on the data received via SMS. The doctor's module allows the doctor to capture all the attributes of an affected joint discretely using the graphical representation of the joints and associated dialog boxes. The complete Graphical User Interface (GUI) development and data base design are discussed and test cases are presented. We plan to evaluate the application in a real healthcare environment for usability, its role in improving patient satisfaction and health outcomes

Efficient Passive Clustering and Gateways selection MANETs

Passive clustering does not employ control packets to collect topological information in ad hoc networks. In our proposal, we avoid making frequent changes in cluster architecture due to repeated election and re-election of cluster heads and gateways. Our primary objective has been to make Passive Clustering more practical by employing optimal number of gateways and reduce the number of rebroadcast packets

Link-Reliability Based Two-Hop Routing for Wireless Sensor Networks

Wireless sensor networks (WSNs) emerge as underlying infrastructures for new classes of large scale networked embedded systems. However, WSNs system designers must fulfill the Qualityof-Service (QoS) requirements imposed by the applications (and users). Very harsh and dynamic physical environments and extremely limited resources are major obstacles for satisfying QoS metrics such as reliability, timeliness, and system lifetime. The limited communication range of WSN nodes, link asymmetry, and the characteristics of the physical environment lead to a major source of QoS degradation in WSNs. This paper proposes a Real-Time Traffic-Differentiated Routing protocol for Wireless Sensor Networks (WSNs). It targets WSN applications having different types of data traffic with several priorities. The protocol achieves to increase packet reception ratio and reduce end-to-end delay while considering multi-queue priority policy, two-hop neighborhood information, link reliability and power efficiency. The protocol is modular and utilizes memory and computational effective methods for estimating the link metrics. Numerical results show that the proposed protocol is a feasible solution to addresses QoS service differentiation for traffic with different priorities

Real-Time Link-Reliability Routing for QoS in Wireless Sensor Networks

This paper proposes a Real-Time Link Reliability Routing protocol for wireless sensor networks (WSNs). The protocol achieves to reduce packet deadline miss ratio while considering link reliability, two-hop velocity and power efficiency and utilizes memory and computational effective methods for estimating the link metrics. Numerical results provide insights that the protocol has a lower packet deadline miss ratio and improved sensor network lifetime. The results show that the proposed protocol is a feasible solution to the QoS routing problem in wireless sensor networks that support real-time applications

Two-Hop Routing with Traffic-Differentiation for QoS Guarantee in Wireless Sensor Networks

This paper proposes a Traffic-Differentiated Two-Hop Routing protocol for Quality of Service (QoS) in Wireless Sensor Networks (WSNs). It targets WSN applications having different types of data traffic with several priorities. The protocol achieves to increase Packet Reception Ratio (PRR) and reduce end-to-end delay while considering multi-queue priority policy, two-hop neighborhood information, link reliability and power efficiency. The protocol is modular and utilizes effective methods for estimating the link metrics. Numerical results show that the proposed protocol is a feasible solution to addresses QoS service differenti-ation for traffic with different priorities

Base station controlled adaptive clustering for Qos in wireless sensor networks

Wireless Sensor Networks (WSNs) are a collection of nodes organized into a cooperative network. Harsh and dynamic physical environments and extremely limited resources are major obstacles for satisfying QoS metrics. This paper proposes and analyzes an Base station Controlled Adaptive Clustering Protocol (BCACP) for Wireless Sensor Networks suitable to support real time traffic. The protocol achieves fault tolerance and energy efficiency through a dual cluster head mechanism and guarantees the desired QoS by including delay and bandwidth parameters in the route selection process. Simulation results indicate that BCACP reduces overall energy consumption and improves network lifetime while maintaining required QoS