Hybrid Wireless-Optical Broadband-Access Network (WOBAN): A Review of Relevant Challenges

Sarkar, S.; Dixit, Sudhir; Mukherjee, Biswanath

doi:10.1109/jlt.2007.906804

Cited by 275 publications

(122 citation statements)

References 28 publications

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“…Thus, how to design a broadband access network to provide broadband services is essential to the further success of the Internet. Optical networks can provide high bandwidth and low network delay [3] [25] [26]. However, they are too costly to act as broadband access networks.…”

Section: Introductionmentioning

confidence: 99%

Capacity and delay of hybrid wireless broadband access networks

Zhang

Fang

2009

IEEE J. Select. Areas Commun.

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Abstract-An optical network is too costly to act as a broadband access network. On the other hand, a pure wireless ad hoc network with n nodes and total bandwidth of W bits per second cannot provide satisfactory broadband services since the pernode throughput diminishes as the number of users goes large. In this paper, we propose a hybrid wireless network, which is an integrated wireless and optical network, as the broadband access network. Specifically, we assume a hybrid wireless network consisting of n randomly distributed normal nodes, and m regularly placed base stations connected via an optical network. A source node transmits to its destination only with the help of normal nodes, i.e., in the ad hoc mode, if the destination can be reached within L (L ≥ 1) hops from the source. Otherwise, the transmission will be carried out in the infrastructure mode, i.e., with the help of base stations. Two transmission modes share the same bandwidth of W bits/sec. We first study the throughput capacity of such a hybrid wireless network, and observe that the throughput capacity greatly depends on the maximum hop count L and the number of base stations m. We show that the throughput capacity of a hybrid wireless network can scale linearly with n only if m = Ω(n), and when we assign all the bandwidth to the infrastructure mode traffics. We then investigate the delay in hybrid wireless networks. We find that the average packet delay can be maintained as low as Θ(1) even when the per-node throughput capacity is Θ(W ).

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Section: Introductionmentioning

confidence: 99%

Capacity and delay of hybrid wireless broadband access networks

Zhang

Fang

2009

IEEE J. Select. Areas Commun.

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“…This fact has leveraged the emergence of hybrid wireless-optical technologies, where high-capacity optical back-end and wireless front-end are combined. This new access paradigm can provide very high throughputs in a cost-effective manner [9]. At the optical back-end a PON is usually used, because of low maintenance and high reliability, while WiFi and/or WiMax is used at the front-end.…”

Section: A Fiwi Access Architecturementioning

confidence: 99%

Design of QoS-Aware Energy-Efficient Fiber–Wireless Access Networks

Schütz

Correia

2012

J. Opt. Commun. Netw.

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Abstract-Energy-efficient network design has recently become a very important topic because of the energy cost increases in service providers' infrastructures. This is of particular importance in access networks because of the growing demand for digital traffic by end users. Here we address the challenge of reducing the energy consumption of fiber-wireless (FiWi) access networks, which use both optical and radio frequency technologies to provide high bandwidth and ubiquity for end-user applications, while keeping delay under a threshold. Our goal is to find optimal sleep mode schedulings that allow energy consumption to be reduced while keeping packet delay acceptable. For this purpose a mathematical formalization and an algorithm are developed. The results show that the proposed approach is able to reduce the average packet delay, with negligible energy cost increases, in many scenarios, besides being computationally efficient and scalable. The proposed approach may, therefore, serve as a basis for planning and design of quality-of-service-aware energy-efficient FiWi access networks.

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“…The acronym WOBAN, which stands for Wireless-Optical Broadband Access Networks, has been used by the authors in [1] to refer to a Passive Optical Network (PON) whose termination points are attached to wireless (either WiFi-or WiMAX-based) or cellular access technologies.…”

Section: Introductionmentioning

confidence: 99%