"Green" Networking - Multi-Hop Extension of Cellular Mobile Access Networks

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Dr. Vidács Attila
Department of Telecommunications and Media Informatics

The topic of my thesis is „Green” networks – Cellular mobile access networks with multihop extension. This is an alternative technology for network operators to reduce the energy consumption.

In the first chapters I describe the evolution of mobile telephony from the very beginning, at the end I discuss in detail the newest generation of mobile technologies, the Long Term Evolution (LTE), and I try to portray the future with the Long Term Evolution Advanced (LTE-A) technology.

With the birth of the new generation of mobile telephony, the core network has to be modified. This runs under the name of System Architecture Evolution (SAE). I do not go into the detail on this, since it is irrelevant to my project.

In the second part of my thesis, I introduce the multihop technology. While this is not a brand new idea, I show the already standardized network with fixed relays. I introduce the deployment strategies, coordination- and throughput capabilities of the relays. These are already existing and working technologies, so I try to integrate these into mobile devices. To be able to use it widely the already existing network elements and the user equipment have to be modified.

I examine the energy efficiency and which metrics I should use to measure it correctly.

Finally I examine how to calculate the cell sizes during both uplink and downlink, and I specify in more details the case of base station, mobile equipment, and relay node. The calculations in my thesis were done with Microsoft Excel. I present the results for several techniques and bandwidths numerically.

Evaluation is made and I add my own opinion and suggestions in the final section.


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