Advances in Underwater Acoustic Networking

Melodia, Tommaso; Kulhandjian, Hovannes; Kuo, Li-Chung; Demirors, Emrecan

doi:10.1002/9781118511305.ch23

Cited by 192 publications

(126 citation statements)

References 116 publications

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“…However, with advancements in technology, sensors with adjustable ranges are now available. Photoelectric sensors, photoelectric sensors [6], thermocouple-based temperature sensors [7], under water sensors [8], etc. are a few of such commercially available sensors.…”

Section: Introductionmentioning

confidence: 99%

Energy-hole avoidance and lifetime enhancement of a WSN through load factor

Sharma¹,

Sharma²

2017

Turk J Elec Eng & Comp Sci

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Abstract:In wireless sensor networks, nonuniform communication load across a network often leads to the problem of energy holes or hot spots, i.e. nodes nearer high activity regions deplete their energy much faster than nodes elsewhere.This may partition the network into unreachable segments and thus adversely affect network lifetime. The problem is more acute in random and sparsely deployed networks. Therefore, we propose a deployment strategy that, using the least possible nodes, prolongs network lifetime by avoiding energy holes and also ensures full sensing and communication coverage. The scheme handles the energy imbalance by selecting an appropriate set of communication and sensing ranges for each node based on effective load on that node. After adjusting these ranges, nodes are strategically placed at locations where their energy drains uniformly and thus network lifetime is prolonged. The approach is verified analytically and validated through ns-2 based simulation experiments. The results reveal significant improvements over existing schemes.

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Section: Introductionmentioning

confidence: 99%

Energy-hole avoidance and lifetime enhancement of a WSN through load factor

Sharma¹,

Sharma²

2017

Turk J Elec Eng & Comp Sci

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“…But due to many challenges for realizing efficient underwater networking [2][3][4][5][6], a single underwater wireless network can only cover a small area and is often isolated from each other. This is due to the fact that the currently popular underwater communication medium is acoustic wave, which can only provide low transmission rates with large propagation delay [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A Possible Development of Marine Internet: A Large Scale Cooperative Heterogeneous Wireless Network

Jiang¹,

Chen²

2015

JCC

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Today, terrestrial Internet can be easily accessed with various types of terminals almost anytime and anywhere on the land. But this is not yet the case in the ocean mainly due to huge differences between terrestrial and marine environments. Although satellite Internet services are available in marine environments, at the time-being, they are neither cost-effective nor popular due to their inherent weaknesses in construction, launching and operation. Ever-increasing human activities in the ocean require marine Internet to provide handy, reliable and cost-effective high-speed Internet access not only on surface but also underwater in marine environments. This is due to the fact that a huge number of sensors and things have been deployed underwater, and this number is still increasing. How to interconnect them becomes an important issue that is necessarily addressed in order to form large and sophisticated underwater systems. This paper discusses the major available network technologies and new networking approaches that can be used to develop marine Internet, particularly a large scale cooperative heterogeneous wireless network, along with some further research issues.

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“…A number of MAC protocols have been proposed that aim at combating multipath, long propagation delay, and overall energy consumption in UW-ASNs [1,2,3,4]. The energy of the underwater acoustic (UW-A) modem's battery is limited and replacing and/or recharging the battery is in many cases not practical.…”

Section: Introductionmentioning

confidence: 99%

A hybrid MAC protocol with channel-dependent optimized scheduling for clustered underwater acoustic sensor networks

Jagannath

Saji

Kulhandjian

et al. 2013

Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems - WUWNet '13

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We propose a novel optimal time slot allocation scheme for clustered underwater acoustic sensor networks that leverages physical (PHY) layer information to minimize the energy consumption due to unnecessary retransmissions thereby improving network lifetime and throughput. To reduce the overhead and the computational complexity, we employ a two-phase approach where: (i) each member node takes a selfish decision on the number of time slots it needs during the next intra-cluster cycle by solving a Markov decision process (MDP), and (ii) the cluster head optimizes the scheduling decision based on the channel quality and an urgency factor. To conserve energy, we use a hybrid medium access scheme, i.e., time division multiple access (TDMA) for the intra-cluster communication phase and carrier sense multiple access with collision avoidance (CSMA/CA) for the cluster head-sink communication phase. The proposed MAC protocol is implemented and tested on a real underwater acoustic testbed using SM-75 acoustic modems by Teledyne Benthos. Simulations illustrate an improvement in network lifetime. Additionally, simulations demonstrate that the proposed scheduling scheme with urgency factor achieves a throughput increase of 28% and improves the reliability by up to 25% as compared to the scheduling scheme that neither use MDP nor optimization. Furthermore, testbed experiments show an improvement in throughput by up to 10% along with an improvement in reliability.

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Advances in Underwater Acoustic Networking

Cited by 192 publications

References 116 publications

Energy-hole avoidance and lifetime enhancement of a WSN through load factor

Energy-hole avoidance and lifetime enhancement of a WSN through load factor

A Possible Development of Marine Internet: A Large Scale Cooperative Heterogeneous Wireless Network

A hybrid MAC protocol with channel-dependent optimized scheduling for clustered underwater acoustic sensor networks

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