On Demand Routing Protocol to Support Unidirectional Links in Mobile Ad Hoc Networks

International Journal of Distributed Sensor Networks

2015

In real-time multimedia application that is used to monitor the safety of workers and working environment in industrial fields, a burst of multimedia data, such as still images and audio or video streams, generated by multimedia nodes equipped with cameras or microphones on demand, is required to be collected at a server within a specified time bound in a reliable manner. However, due to the limited resources in sensor devices, such as process capability, bandwidth, and energy, it is challengeable to satisfy the time constraints of various real-time multimedia applications. Therefore, we introduce an optimized approach in order to shorten the acquisition period of bursty traffic so that it can satisfy more applications with tighter time constraints. For this purpose, we devise a path reservation scheme for an energy-efficient and time-constrained data transmission and a frame-slot scheduling scheme using two channels that enables the concurrent data transmission. Simulation results show that our proposed approach reduces the bursty data acquisition time and enhances network throughput significantly compared to other ones.

Section: Reliable Tree Constructionmentioning

confidence: 99%

Section: Path Reservationmentioning

confidence: 99%

An Optimized Approach for Time-Constrained and Reliable Bursty Data Acquisition in WMSNs

International Journal of Distributed Sensor Networks

2015

“…We define link ( a , b ) to be bidirectionally reliable ( B‐reliable ) if and only if two directional links from a to b and from b to a are reliable . Some approaches detect the bidirectional link by explicitly exchanging control messages . However, this causes high overhead and lowers detection reliability because the control messages can be lost because of collisions or some other reasons.…”

Section: Principle Designmentioning

confidence: 99%

A slot demand‐based path reservation approach for the timely and reliable delivery of bursty traffic in WMSNs

Concurrency and Computation

2014

Summary In case that we build a context‐aware computing‐based Safety Monitoring and Control System (SMOCS) that monitors the safety of the workers, many sensor devices with different data rates are distributed in the target field. Based on these context data, the SMOCS judges the safety of the working environment primarily. If it perceives a dangerous sign, it requests additional bursty data such as still image or video streaming from a particular sensor device in order to confirm the situation. Because these bursty data have to be delivered to the server reliably with time constraints, it is challengeable to process those data with limited energy and bandwidth. In this paper, we propose an efficient approach to deliver bursty data reliably by reserving time slots to transmit the required packets on all the paths from the selected multimedia nodes to the server. The nodes that are not on the selected paths are put into sleep mode to conserve energy during the transmission of bursty data. We evaluate the proposed approach by conducting experiments using the indoor test bed that consists of 30 sensor communication devices. The experimental results show that the proposed approach can satisfy the requirements of multimedia applications well. Copyright © 2014 John Wiley & Sons, Ltd.

“…Some approaches detect the bi-directional link by explicitly exchanging control messages [35]. However, this causes high overhead and lowers detection reliability since the control messages can be lost due to collision or some other reasons.…”

Section: I-mac Protocol Descriptionmentioning

confidence: 99%

Design and Implementation of a MAC Protocol for Timely and Reliable Delivery of Command and Data in Dynamic Wireless Sensor Networks

2013

Sensors

This paper proposes and implements a new TDMA-based MAC protocol for providing timely and reliable delivery of data and command for monitoring and control networks. In this kind of network, sensor nodes are required to sense data from the monitoring environment periodically and then send the data to a sink. The sink determines whether the environment is safe or not by analyzing the acquired data. Sometimes, a command or control message is sent from the sink to a particular node or a group of nodes to execute the services or request further interested data. The proposed MAC protocol enables bidirectional communication, controls active and sleep modes of a sensor node to conserve energy, and addresses the problem of load unbalancing between the nodes near a sink and the other nodes. It can improve reliability of communication significantly while extending network lifetime. These claims are supported by the experimental results.