نتایج جستجو برای: underwater mac protocols
تعداد نتایج: 141928 فیلتر نتایج به سال:
Due to the characteristics of underwater acoustic channel, media access control (MAC) protocols designed for underwater acoustic sensor networks (UWASNs) are quite different from those for terrestrial wireless sensor networks. Moreover, in a sink-oriented network with event information generation in a sensor field and message forwarding to the sink hop-by-hop, the sensors near the sink have to ...
Underwater wireless sensor networks (UWSNs) has gained attention to researcher due to their wide range of applications. However, due to their power constrains and limitations, an energy efficient MAC protocol is required. Existing MAC protocols for terrestrial WSNs are not sufficient to solve the issues in UWSNs. Therefore, to design a new MAC protocol for UWSNs it is required to study the fact...
This report summarizes our research directions in underwater sensor networks. We highlight potential applications to off-shore oilfields for seismic monitoring, equipment monitoring, and underwater robotics. We identify research directions in short-range acoustic communications, MAC, time synchronization, and localization protocols for highlatency acoustic networks, long-duration network sleepi...
Document Overview In the present deliverable, we briefly summarize the current trends and state-of-the-art on networking solutions for Underwater Wireless Acoustic Sensor Networks (UWASNs). In particular, the focus of the document is on Medium Access Control (MAC), Routing, Localization and Synchronization, as well as on node positioning and mobility. Our literature search points out that, alth...
I. PROBLEM DESCRIPTION Underwater sensor networks present a unique set of challenges due their long propagation delays, low data rates, and high transmit power. These require a thorough redesign of medium access control (MAC) functionalities. Here, we focus on the important case of a broadcast MAC, where all neighbors of a node are the intended receivers (not to be confused with network-layer b...
Underwater sensor networks have received growing interests recently [7], [5], [4], [1]. Compared with traditional techniques used in underwater activities such as scientific exploration and commercial exploitation, underwater sensor networks empower people to monitor or detect phenomena more accurately and timely in extended areas. The medium access control (MAC) protocol is very important to t...
Many potential applications such as ocean sampling network, environment monitoring, undersea exploration, disaster prevention, assisted navigation, and mine reconnaissance can be provided by deploying the Underwater Acoustic Sensor Networks. Because of the peculiarities of acoustic communication in underwater, the MAC protocol which play a role of managing and controlling the channels, must ove...
The focus of this paper is on the multi-channel MAC protocols for underwater acoustic sensor networks. We model and analyze two generalized multi-channel MAC protocols: multi-channel access with Aloha on a dedicated control channel and multi-channel access with RTS/CTS on a dedicated control channel. Though the long delay feature of underwater acoustic channels drastically increases the complex...
Underwater acoustic networks (UANs) have drawn significant attention from both academia and industry in recent years. Even though a number of underwater MAC protocols have been proposed and studied based on simulations and theoretical analysis, few work has been conducted to test these protocols in multi-hop real sea experiments. Due to the complex multipath environment, fast varying acoustic c...
The interest in monitoring applications using underwater sensor networks has been growing in recent years. The severe communication restrictions imposed by underwater channels make that efficient monitoring be a challenging task. Though a lot of research has been conducted on underwater sensor networks, there are only few concrete applications to a real-world case study. In this work, hence, we...
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