Abstract
This paper examines the reduction in the non-renewable power consumption of transport networks including core, metro and access layers when Video-on-Demand (VoD) content is cached in solar-powered fog data centres with Energy Storage Devices (ESDs). The effects of considering optical bypass routing and Mixed Line Rate (MLR) in the core network, the availability of solar renewable energy in the access network, and optimising the use of ESDs were addressed. A Mixed Integer Linear Programming (MILP) model that considers the above factors was developed to optimise delivering VoD content from cloud data centres in the core network or fog data centres in the access network.
Highlights
The architecture introduced and the optimisation model resulted in reducing the total brown power consumption which includes the brown power used by the brown-powered data centres in addition to the brown power used by the Passive Optical Network (PON) access networks, Ethernet metro networks, and Internet Protocol (IP) over WDM core network
For the IP over WDM network, 2020 equipment power consumption was assumed, optical bypassing and Mixed Line Rate (MLR) were considered to examine the reduction in the brown power consumption while considering efficient future networks
For the first scenario, the results show that as the PUEF reduces, it becomes more energy efficient to deliver from fog data centres
Summary
Compound Annual Growth Rate (CAGR) of 54% from 2016 to 2021 in video traffic was estimated in [1]. Reducing CO2 emission, which rises with the increase in brown power consumption, was considered by using renewable resources to power core network nodes and data centre equipment. The work in [45] reduced the cost for powering cloud data centres by implementing ESDs and energy trading for different renewable sources by optimising the consumption, storage and trading with power grids while addressing the inefficiencies with charging and discharging the batteries. The work in this paper extends the work in [46] and utilises a MILP model to optimise the reduction in transport networks non-renewable power consumption when delivering VoD traffic by maximising the use of solar renewable energy in fog data centres with ESDs in the access network.
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