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Green Cellular Networks through QoS Aware Dynamic Base Station - Mobile Device Reconfiguration

Abstract

Anytime-anywhere connectivity offered by cellular networks and mobile devices

with multimedia capabilities have revolutionized important sectors of the society such

as health care, education, finance, e-commerce and entertainment. To cater to the

resulting explosive growth in mobile data traffic in an economically and environmentally

sustainable manner, it is critical to efficiently manage the spectral and energy/power

consumption of cellular networks. In this thesis, we identify the key challenges faced by

the cellular networks in efficiently managing energy/power consumption and propose

solutions to alleviate the same.

Rapid advances in processing capabilities of mobile devices and relatively slower

advances in battery capacity capabilities has created a huge gap between power required

for processing advanced multimedia applications and the available battery capacity. Data

and compute intensive mobile video is the leading multimedia application and leads to

quick drain in the mobile battery level. In the first part of the thesis, we address the

above challenge by developing battery aware mobile video download techniques that

increase the battery available time while maintaining the required user experience levels.

Extensive experiments have demonstrated the feasibility and efficacy of our approach.

Base stations are the dominant contributors to power consumption of cellular

networks. To ensure that quality of service requirements is always met, base stations are

over provisioned to handle maximum load and are always switched on. This is leads to

wasteful expenditure of electricity when load is less than maximum. To address this, we

develop techniques that adapt the coverage area of base stations depending on load to

reduce base station power consumption. Simulation experiments have demonstrated the

significant power savings is possible using the proposed techniques.

Multi-input, multi-output technologies which require multiple Radio Frequency

(RF) chains are being adopted to increase the data rates and coverage capabilities of

base stations. This implies that the already dominant contribution of RF chains to power

consumption of base stations will significantly increase. We conclude the thesis by

developing techniques that switch off RF chains depending on load to reduce base station

power consumption. Simulation experiments demonstrate the power savings possible

using proposed techniques compared to existing techniques.

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