Availability Modeling of FSO/RF Mesh Networks through Turbulence-Induced Fading Channels

Moradi, Hassan; Falahpour, Maryam; Reafi, Hazem H.; LoPresti, Peter G.; Atiquzzaman, Mohammed

doi:10.1109/infcomw.2010.5466617

Cited by 15 publications

(11 citation statements)

References 8 publications

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“…They incorporated FSO trans receivers and proved that upper bound capacity can be increased by (43) M. Siraj, M. Shoaib, I. Memon a hybrid (RF/FSO) routing scheme. Hybrid RF/FSO mesh networks were investigated for node availability and reliability [9]. In [10] FSO links were introduced to minimize RF link interference with the smallest number of FSO links used.…”

Section: Related Workmentioning

confidence: 99%

Performance Enhancement of Telemedicine Network by Free Space Optics Links Provisioning

Siraj

Shoaib

Memon³

2017

Acta Phys. Pol. A

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Health care has benefited immensely with the implementation of fast moving information technology. It is a challenging assignment for the researchers to implement the present day technologies such as wireless mesh networks. Wireless mesh networks are deployed to guarantee a reliable and stable network infrastructure backbone to telemedicine systems. They are preferred to other wireless networks, as the solution which they provide is robust for broadband services. They are robust because if routing is not possible due to some mesh nodes failure, routing can be done by the other mesh nodes present. Wireless mesh network cannot only spread coverage but also save both cabling cost and human resource. However, their performance is degraded due to interference and varying load. Interference is a critical issue in wireless mesh networks. The interference occurs because of the congested unlicensed radio frequency spectrum. This problem can be addressed by applying free space optics technology for transmission instead of radio frequency technology in the unlicensed spectrum. Network capacity issue is addressed by provisioning free space optics links to generate the much needed throughput and to minimize interference. Telemedicine network is a network, which requires a high capacity bandwidth to cater for a large number of remote patients. It is observed that free space optics links provisioning results in a significant performance enhancement for the telemedicine network.

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Section: Related Workmentioning

confidence: 99%

Performance Enhancement of Telemedicine Network by Free Space Optics Links Provisioning

Siraj

Shoaib

Memon³

2017

Acta Phys. Pol. A

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“…Obviously, if we add additional constraints for the case of T = 20 in the form of S i (2t) = S i (2t−1) for t ∈ {1, 2, .., 10}, then ILPs are equivalent and therefore R 20 = R 10 . As a result, by removing theses additional constraints from the T = 20 case, the ILP is relaxed and R 20 is lower bounded by R 10 . This argument is true in general so we have R T ≤ R kT for all 1 ≤ k. Therefore, larger values of T can provide higher gains.…”

Section: E Performance Vs Complexitymentioning

confidence: 99%

“…Moradi et al investigated the path reconfiguration probability in atmosphere turbulence fading channels. They showed that the reconfiguration probability is not necessarily increased by the intensity of turbulenceinduced lognormal fading for FSO link [10]. In addition to the reliability issue, the high expense of the FSO technology is still one of the major barriers against its development.…”

Section: Introductionmentioning

confidence: 99%

Optimal Placement of FSO Links in Hybrid Wireless Optical Networks

Ahdi

Subramaniam

2011

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

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Wireless mesh network addresses the last mile issue; however, RF-based technologies are still a bottleneck for todays' media-rich applications. In this paper, we propose enhancing the capacity of an existing wireless mesh backhaul using freespace optical links. Such a hybrid RF/FSO network is capable of multiplying the available bandwidth for each subscriber if the FSO transceivers are placed at strategically located nodes. Adopting a TDMA-based framework, we formulate a problem for the optimal placement of FSO transceivers and RF link activation schedules which maximize the network capacity. An integer-linear program (ILP) is developed to obtain an optimal solution. Due to the complexity of this ILP, we also propose a relaxation which yields an upper bound on the network capacity in such an architecture, and develop a probabilistic heuristic that approaches this capacity. We show by simulations that our heuristic achieves a high fraction of the network capacity upper bound, and it can be implemented efficiently.

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“…However, it may not be possible to apply these asymptotic results based on a random network model to practical WMNs. The node reliability and availability of reconfigurable hybrid FSO/RF mesh networks are investigated in [3]. In [4], FSO links are introduced to WMNs when the number of RF channels is insufficient for the traffic.…”

Section: Introductionmentioning

confidence: 99%

Link allocation, routing and scheduling of FSO augmented RF wireless mesh networks

Tang

Brandt-Pearce

2012

2012 IEEE International Conference on Communications (ICC)

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Wireless Mesh Networks (WMNs) are designed to provide broadband wireless services; however, capacities of WMNs are fundamentally limited in bandwidth because of the scarcity of RF spectral resources. A solution is to design a WMN using multiple wireless technologies. Since the optical spectrum remains unlicensed and under-utilized, we propose to augment RF WMNs with free space optical (FSO) systems. FSO links do not interfere with RF links and have higher capacity than RF links. In this paper, we study the throughput improvement of FSO-augmented RF WMNs. We address two questions. First, given a fixed number of FSO links, where should we install them to achieve the maximum improvement of network throughput for given traffic demands? Second, how do we route and schedule the flows in the hybrid FSO/RF network to achieve this throughput? We jointly formulate the above problems as one mixed integer linear programming problem. The results show that the throughput of the network increases dramatically by properly allocating FSO links. We also provide a computationally efficient algorithm to evaluate upper and lower bounds on the throughput of this hybrid FSO/RF network. The network administrator can use these bounds to determine the tradeoff between the number of FSO links (which are expensive) and the throughput improvement. I. INTRODUCTIONWireless mesh networks (WMNs) have emerged to meet the growing demand for broadband wireless services. However, the performance of WMNs is limited by the cluttered RF spectrum. Free space optical (FSO) technology, using the unlicensed optical spectrum, is an alternative to RF technology for broadband wireless networks. FSO links can provide much higher data rate than RF links and do not interfere with RF links in the network. Among various wireless mesh network architectures [1], we are interested in infrastructure WMNs, as illustrated in Figure 1. Such WMNs consist of mesh routers (MRs) and mesh clients (MCs). The MRs in this infrastructure WMN form a backbone for MCs and are generally stationary. Thus, FSO technology, difficult to use in mobile environments but well adapted to stationary systems, can be added to this network to improve the network performance. Two major questions addressed in this paper are: (1) given a fixed number of FSO links, what is the maximum throughput of the network achievable by adding those FSO links? (2) how do we achieve this throughput by properly allocating the FSO links and choosing routing and scheduling schemes?There have been several studies on hybrid FSO/RF networks using different models based on their particular applications.

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Availability Modeling of FSO/RF Mesh Networks through Turbulence-Induced Fading Channels

Cited by 15 publications

References 8 publications

Performance Enhancement of Telemedicine Network by Free Space Optics Links Provisioning

Performance Enhancement of Telemedicine Network by Free Space Optics Links Provisioning

Optimal Placement of FSO Links in Hybrid Wireless Optical Networks

Link allocation, routing and scheduling of FSO augmented RF wireless mesh networks

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