Abstract
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.
Highlights
The evolution of hardware technologies, such as tiny and inexpensive cameras and microphones, has enabled the application of wireless multimedia sensor networks (WMSNs) to several different areas
The sensor nodes related to the transmission path from the active multimedia node (AMN) to the server remain active to forward the bursty traffic, and the others are kept in sleep mode to preserve energy during the bursty data transmission period (BDTP)
OpMAC reduces the data acquisition time by 33% compared with TreeMAC and 37% compared with I-MAC
Summary
The evolution of hardware technologies, such as tiny and inexpensive cameras and microphones, has enabled the application of wireless multimedia sensor networks (WMSNs) to several different areas (e.g., structure safety monitoring, industrial automation, military operation, and intelligent transportation systems). Due to the energy constraint of a sensor node, most of contentionbased MAC protocols for low duty-cycled applications try to reduce energy consumption, but increase packet latency as well They may suffer from low reliability of data transmission due to the interference or collision problem, especially in case of high density network. Taking into consideration the requirements of multimedia applications in WMSNs and the problem of the existing approaches in support of bursty data acquisition, we propose an optimized method with the aim of delivering bursty traffic from sensor nodes to a server timely and reliably. To shorten the bursty data acquisition time and increase the network throughput, we employ a channel-slot allocation scheme in which a pair of ⟨channel, slot⟩ for either sending or receiving state are allocated to the corresponding node in a totally distributed manner.
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