| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 100 === In recent years, environmental concerns have caught general public’s attentions globally. The Carbon emission of the ICT industry also becomes a well-known issue gradually, not only because of its environmental impact but also due to the growth of operation cost coming from electricity consumptions.
There are two kinds of common strategies for power saving in telecommunication networks, one is reducing energy consumption of individual devices; the other is switching off idle network elements. It is well known that broadband access networks fall into the former category rather than the latter because of its tree topology. However, by introducing a new device, such as personal switch router, into the architecture in user-end, one can re-direct the traffic flows from the wired access network to the wireless access network, when the latter is a more power effective solution. In our study, we discover that we can even switch off wired access network during low-traffic periods, if the wireless access network is required to be always active.
In order to prove the feasibility of the initiative, in this thesis we adopt models from various academic papers and the log files of NTU ADSL to create a reasonable user profile, and then we propose several heuristic algorithms to support its power saving operations. Finally, we examine the effectiveness of this power-saving approach from the new hybrid architecture via computer simulation. Based on user’s activity of NTU ADSL access networks, the simulation results reveal that the wired access network can be turned off up to 40% of time in normal circumstances and 20% in some extreme conditions, and the total power-saving can be up to 13%. In sum, the brand new architecture we proposed in this thesis should be a promising solution for future hybrid access networks.
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