ASO-TDMA: ad-hoc self-organizing TDMA protocol for shipborne ad-hoc networks

Yun, Changho; Lim, Yong‐Kon

doi:10.1186/1687-1499-2012-320

Cited by 17 publications

(23 citation statements)

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“…SO-TDMA [3] and ASO-TDMA [4] use a self organized TDMA scheme for the access control. However, these protocols were thought for VHF radio frequencies and they are used for the localization of vessels and ships in the ocean.…”

Section: Related Workmentioning

confidence: 99%

“…To facilitate this process, UWSO-TDMA divides the frame in sub-frames like in [4]. The amount of available slots in a sub-frame is a designer decision, based on the amount of expected nodes in each region of the network.…”

Section: Initializationmentioning

confidence: 99%

“…Considering the needs and the challenges to implement underwater acoustic sensors networks, and the limitations that the current approaches for implementing MAC protocol for this type of networks, this paper proposes an extended medium access control protocol based on Time Division Multiple Access (TDMA), but specifically for UWASN. The transmission mechanism is inspired in the self-organized TDMA [3] and the ad-hoc self-organized TDMA [4]. However, its operation is simpler than the previous ones, involving only two phases for the configuration and operation.…”

Section: Introductionmentioning

confidence: 99%

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A MAC Protocol for Underwater Sensors Networks

Santos

Orozco

Ochoa

et al. 2015

Lecture Notes in Computer Science

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Abstract. Underwater sensor networks are becoming an important field of research, because of its everyday increasing application scope. Examples of their application areas are environmental and pollution monitoring (mainly oil spills), oceanographic data collection, support for submarine geo-localization, ocean sampling and early tsunamis alert. It is well-known the challenge that represents to perform underwater communications provided that radio signals are useless in this medium and a wired solution is too expensive. Therefore, the sensors in these network transmit their information using acoustic signals that propagate well under water. This data transmission type bring an opportunity, but also several challenges to the implementation of these networks, e.g., in terms of energy consumption, data transmission and signal interference. Few proposals are available to deal with the problem in this particular application scenario, and these proposals does not address properly the transmission of underwater acoustic signals. In order to help advance the knowledge in the design and implementation of these networks, this paper proposes a MAC protocol for acoustic communications between the nodes based on a self-organized time division multiple access mechanism. The proposal is still preliminary and it has only been evaluated in the laboratory; however, it represents a highly promising behavior that make us expect interesting results in real-world scenarios.

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Section: Related Workmentioning

confidence: 99%

Section: Initializationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A MAC Protocol for Underwater Sensors Networks

Santos

Orozco

Ochoa

et al. 2015

Lecture Notes in Computer Science

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“…In the proposed short-range UWA communications system, the ad-hoc self-organizing TDMA (ASO-TDMA) [3] , which is a novel multiple access scheme based on TDMA, is adopted. The proposed frame structure is completely compatible with the ASO-TDMA scheme.…”

Section: ⅲ Multi-hop Ofdm Frame Structure Designmentioning

confidence: 99%

A Multi-hop OFDM Frame Structure for Short-Range Underwater Acoustic Communication Networks

Yu¹,

Kim²,

Chang³

2015

The Journal of Korean Institute of Communications and Informati

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BSTRACTIn this paper, for the purpose of providing high data rate services, the multi-hop frame structure is designed for the underwater acoustic (UWA) short-range system which is proposed as a part of ocean surveillance and tracking network (OSTN).Under the measured underwater channel environment, the link-level system performance are also evaluated.Simulation results show not only the packet error rate (PER) comparisons, but the optimal modulation and coding scheme (MCS) levels for the orthogonal frequency division multiplexing (OFDM) based short-range UWA communications network. Therefore, it is quite valuable to design the frame structure to provide high data rate services.In this paper, we design the multi-hop frame structure for the short-range UWA communications network, and evaluate the system performance by the link-level simulation results. Ⅱ. System Model and ParametersThe underwater environment differs greatly from the terrestrial wireless world. Therefore, existing wireless models can not be used for underwater network test directly. It should be also noted that the underwater channel environment varies greatly with communication distance. In order to model the underwater channel accurately, we categorized the UWA communications into short, medium, and long range systems [1] . In this paper, we focus on the short-range system. Short-range UW Channel ModelThe UWA short-range system within 1 km is introduced in [1]. To simulate the UWA channel environment, the channel model over 500 meters is adopted from [2], where the model was estimated by using the measured data. Fig. 1 shows the channel impulse response. OFDM System ParametersBased on the information provided by Fig. 1, OFDM system parameters are calculated and presented in Table 1. The guard interval (GI) of the OFDM symbol should be set larger than the maximum multipath delay ( max=7.7 ms) to overcome the selective fading. GI which causes energy loss (0.97 dB in this paper) should be kept minimum, but considering the application of windowing and to guarantee the no ISI even in the worst case of delay spread, we select the value of 10 ms as GI value which also makes frame structure design easier.

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“…Simultaneously, the demand for maritime radio spectra for digital data exchange that requires a higher data rate and longer payload size than those of AIS is increasing [2]. To handle these situations, several VHF channels were allocated for the purpose of digital VHF data exchange (VDE) at the World Radiocommunication Conference 2012 (WRC-12) [3].…”

Section: Introductionmentioning

confidence: 99%

EASO-TDMA: enhanced ad hoc self-organizing TDMA MAC protocol for shipborne ad hoc networks (SANETs)

Yun

Lim

2015

J Wireless Com Network

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As very high frequency (VHF) data links are overloaded due to the rise of Automatic Identification System (AIS) applications, additional VHF channels and the development of corresponding communication technologies are necessary. For this reason, shipborne ad hoc networks (SANETs) and the medium access (MAC) protocol for SANETs, ad hoc self-organizing-time division multiple access (ASO-TDMA), have been proposed, which provide ocean-going ships with diverse data services cost-effectively. In this paper, a new MAC protocol for SANETs, enhanced ASO-TDMA (EASO-TDMA), is proposed in order to manage the bottleneck and under-utilization problems resulting from ASO-TDMA and thus enhances the overall performance of SANETs. To accomplish this, in EASO-TDMA, a ship adaptively allocates its time slots according to the number of subscribing ships, which make their communication route to a base station at the shore via the ship, by referring to the routing table. The performance of EASO-TDMA is investigated through simulations and compared with that of ASO-TDMA. The simulation results indicate that EASO-TDMA outperforms ASO-TDMA, regardless of the network conditions, with 25% higher reception success rate, 25% lower collision rate, and 21% higher channel utilization at maximum. In particular, the end-to-end delay of EASO-TDMA is on average 1/12 of that of ASO-TDMA, and this implies that EASO-TDMA can be effective for delay-sensitive data services.

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ASO-TDMA: ad-hoc self-organizing TDMA protocol for shipborne ad-hoc networks

Cited by 17 publications

References 1 publication

A MAC Protocol for Underwater Sensors Networks

A MAC Protocol for Underwater Sensors Networks

A Multi-hop OFDM Frame Structure for Short-Range Underwater Acoustic Communication Networks

EASO-TDMA: enhanced ad hoc self-organizing TDMA MAC protocol for shipborne ad hoc networks (SANETs)

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