Improving Energy Efficiency and Throughput in Heterogeneous Mobile Ad Hoc Networks

Innovations in Mobile Multimedia Communications and Applications ◽

10.4018/978-1-60960-563-6.ch003 ◽

2011 ◽

pp. 37-49

Author(s):

Manu J. Pillai ◽

M. P. Sebastian

Keyword(s):

Ad Hoc ◽

Transmission Rate ◽

Mac Protocol ◽

Signal Loss ◽

High Data ◽

Communication Links ◽

Adhoc Networks ◽

Simulation Results ◽

Demand Routing ◽

Hoc Networks

The nodes are expected to transmit at different power levels in heterogeneous mobile adhoc networks, thus leading to communication links of different length. Conventional MAC protocols that unconditionally presume that links are bi-directional and with unvarying energy distribution may not succeed or execute badly under such circumstances. Interference and signal loss resulting out of distance and fading diminish the entire throughput attained in heterogeneous networks to a greater extent. This article presents a MAC protocol, which adaptively transmits data frames using either the energy efficient nodes or a list of high data rate assistant nodes. In addition, a cross-layer based energy level on-demand routing protocol that adaptively regulates the transmission rate on basis of congestion is projected as well. Simulation results illustrate that the proposed protocols considerably diminish energy consumption and delay, and attain high throughput in contrast with the Hybrid MAC and traditional IEEE 802.11 protocols

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A Power Optimization Algorithm for Ad Hoc Networks with Variable Rate Control

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.470.611 ◽

2013 ◽

Vol 470 ◽

pp. 611-616

Author(s):

Xuan Jie Ning ◽

Hai Zhao ◽

Mao Fan Yang ◽

Dan Wu

Keyword(s):

Ad Hoc Networks ◽

Rate Control ◽

Ad Hoc ◽

Transmission Rate ◽

Mac Protocol ◽

Network Capacity ◽

Data Rate ◽

Medium Access ◽

High Data ◽

Hoc Networks

This paper is concerned with the capacity of ad hoc networks employing pure ALOHA medium access control (MAC) protocol under the effect of different transmission power levels and variable data rate control. The data rate of a certain link is related to the signal to interference plus noise ratio (SINR), and SINR is, in turn, related to the transmitted power and link distance. The increasing power conducts a high data rate, resulting in the high interference of networks. Consequently, the optimum power that yields maximum network throughput is a tradeoff between transmission rate and network interference. Mathematical model analysis for the ad hoc network capacity are presented in the paper. A revised expression to the approximate calculating of the capture probability in networks is proposed.

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Research on Statistics Based Multi-Priority MAC Protocol for Ad Hoc Networks

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.3103 ◽

2014 ◽

Vol 644-650 ◽

pp. 3103-3107

Author(s):

Peng Wang ◽

Hai Li ◽

Ben Li Ye ◽

Chen Chen ◽

Yu Bao Wang

Keyword(s):

Ad Hoc Networks ◽

Success Rate ◽

Ad Hoc ◽

Mac Protocol ◽

Medium Access ◽

Critical Data ◽

Low Delay ◽

Simulation Results ◽

Hoc Networks ◽

Application Diversification

With the growing application diversification in Ad Hoc networks, it is particularly important to support prioritization of traffic and ensure that critical data can be delivered more reliably and faster in an emergency scene. We mainly study on the improvement of statistics based multi-priority medium access control (MAC) protocol, including the channel occupancy statistic and the backoff mechanism. We conduct comprehensive simulations based on the OPNET Modeler and account for the success rate results with theoretical analysis. The simulation results show that the proposed algorithm can simultaneously guarantee high success rate and low delay for high-priority packets.

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OCA-MAC: A Cooperative TDMA-Based MAC Protocol for Vehicular Ad Hoc Networks

Sensors ◽

10.3390/s19122691 ◽

2019 ◽

Vol 19 (12) ◽

pp. 2691 ◽

Cited By ~ 3

Author(s):

Yao Liu ◽

Hongjing Zhou ◽

Jiawei Huang

Keyword(s):

Ad Hoc Networks ◽

Data Transmission ◽

Vehicular Ad Hoc Networks ◽

Ad Hoc ◽

Model Simulation ◽

Transmission Rate ◽

Mac Protocol ◽

Destination Node ◽

Hoc Networks ◽

Cooperative Nodes

Cooperative communication is an effective method of improving the transmission performance for vehicular ad hoc networks. However, the rapid movement of vehicles leads to frequent changes in network topology and reduces the probability of successful data transmission on the medium access control (MAC) layer. In this paper, we propose an Optimal Cooperative Ad hoc MAC protocol (OCA-MAC) based on time division multiple access (TDMA). OCA-MAC utilizes multiple cooperative nodes to forward data, so as to improve the probability of successful data transmission. It chooses cooperative nodes according to direct successful transmission probability, communication range between potential helper node and destination node, and available time slot. Meanwhile, in order to avoid excessive transmission redundancy caused by multiple cooperative forwarding, the optimal number of cooperative forwarding nodes is obtained through analysis of a probabilistic model. Simulation results show that OCA-MAC improves the successful data transmission rate and reduces the number of transmission times and transmission delay compared to the multichannel TDMA MAC protocol (VeMAC) and the cooperative ad hoc MAC protocol (CAH-MAC).

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An Efficient Broadcasting TDPA Protocol for Ad Hoc Networks with Directional Antenna

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.330.1036 ◽

2013 ◽

Vol 330 ◽

pp. 1036-1040

Author(s):

Zhao Ran He ◽

Hai Bin Shi

Keyword(s):

Ad Hoc Networks ◽

Network Performance ◽

Ad Hoc ◽

Mac Protocol ◽

Network Capacity ◽

Directional Antenna ◽

Network Throughput ◽

Spatial Reuse ◽

Simulation Results ◽

Hoc Networks

Directional antenna has tremendous potential in improving the network capacity and anti-jamming compared with omni-directional antenna for ad hoc networks. In this article, a novel MAC protocol called TDPA based on TDMA was presented for ad hoc networks with directional antenna. It improved the spatial reuse by adaptively selecting interference-free angle according to communicating nodes positions, and increased the network throughput and broadcasting efficiency by piggyback retransmission technique. Analysis and simulation results showed that it can significantly improve network performance.

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MAC Protocol for Ad Hoc Networks Using a Genetic Algorithm

The Scientific World JOURNAL ◽

10.1155/2014/670190 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Omar Elizarraras ◽

Marco Panduro ◽

Aldo L. Méndez ◽

Alberto Reyna

Keyword(s):

Genetic Algorithm ◽

Ad Hoc Networks ◽

Ad Hoc Network ◽

Multiple Access ◽

Ad Hoc ◽

Transmission Rate ◽

Mac Protocol ◽

Medium Access ◽

Hoc Networks ◽

Code Division Multiple

The problem of obtaining the transmission rate in an ad hoc network consists in adjusting the power of each node to ensure the signal to interference ratio (SIR) and the energy required to transmit from one node to another is obtained at the same time. Therefore, an optimal transmission rate for each node in a medium access control (MAC) protocol based on CSMA-CDMA (carrier sense multiple access-code division multiple access) for ad hoc networks can be obtained using evolutionary optimization. This work proposes a genetic algorithm for the transmission rate election considering a perfect power control, and our proposition achieves improvement of 10% compared with the scheme that handles the handshaking phase to adjust the transmission rate. Furthermore, this paper proposes a genetic algorithm that solves the problem of power combining, interference, data rate, and energy ensuring the signal to interference ratio in an ad hoc network. The result of the proposed genetic algorithm has a better performance (15%) compared to the CSMA-CDMA protocol without optimizing. Therefore, we show by simulation the effectiveness of the proposed protocol in terms of the throughput.

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