Abstract
The ever increasing demand for higher data rates and more flexible deployment has accelerated the need for integrating optical fiber with wireless networks. Fiber-wireless (FiWi) network consists of a fiber back-end network integrated with a wireless front-end. With the growing popularity of the FiWi network, it is essential to look into energy conservation mechanisms as well. One such energy conservation mechanism is to employ a renewable source of energy, such as solar energy. In this article, we have analysed an integrated FiWi network composed of a 10-Gigabit-capable passive optical network (XG-PON) with a WiFi front end. It is assumed that solar panels are installed at the optical network units (ONUs). Depending on the availability of solar power as well as the load generated due to data traffic at ONU, the requirement of resources to power the ONU varies. Consequently, we propose a) Battery allocation (BA) algorithm and b) Photovoltaic (PV) panel allocation (PA) algorithm, for both off-grid as well as on-grid scenarios. To analyse the cost-effectiveness of the proposed algorithms, battery lifetime has also been calculated. Through the obtained results, it has been demonstrated that for locations with good solar profile, there can be a significant reduction in the number of batteries as well as PV panels required to operate a FiWi network.
Highlights
I NCREASING demand for ubiquitous coverage with seamless connectivity has created many new opportunities for the development of an access network
Since our work focus on the upstream traffic flow, the traffic arrival request rate for the downstream traffic is considered to be very low (0.05 request per 125μs), and the upstream traffic request rate is based upon the sum of the average throughput requirement for the users associated with the ONU
In this paper, we proposed resource allocation algorithms to cater for power requirement in ONUs for a FiWi network
Summary
I NCREASING demand for ubiquitous coverage with seamless connectivity has created many new opportunities for the development of an access network. The authors in [4] presented the trends of ONU placement for a PON and WMN based FiWi network. They discussed the ONU sleeping strategies for energy conservation of the network. In [12], the authors discussed the energy conservation scheme based on medium access control (MAC) protocol for NG-PON They observed that in terms of energy efficiency, cost-effectiveness, and delay, cyclic sleep mode is more apt than the other modes of operation. In this paper, we propose a resource allocation scheme to power ONU in a solar-powered FiWi network. We propose an off-grid battery allocation (OFF-BA) algorithm to minimize the number of batteries required to power the ONU for the scenarios where grid power supply is not available. Based on the traffic requests, the power consumption of the ONU is calculated as given in Section II B
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