دانلود رایگان مقاله تحلیل کارآیی اقتصادی در راه حل صرفه جویی در انرژی برای شبکه دسترسی بی سیم

abstract

As the energy bill for mobile operators rises with the continuing traffic growth, energy efficiency problems attract an increasing attention in the telecommunication industry. However, the investment for the implementation of any energy-saving solution could be so costly that it may not achieve the total cost reduction. Therefore, the economic viability of the proposed solutions is of substantial importance for the operators in the process of investment decisions. In this paper, we present a methodology for assessing the economic viability of energy-saving solutions. We conduct two case studies using the proposed methodology, and analyze the cost-benefit tradeoff for: (i) hardware upgrade enabling dynamic sleep mode operation at the base stations (BSs), and (ii) energy efficient network deployment minimizing the network energy consumption. Simulation results show that the hardware upgrade can save up to 60% of energy consumption particularly when the high data rate requirement forces low network resource utilization. Consequently, the solution is shown to be increasingly cost effective as the unit energy cost increases. Network deployment optimized for energy efficiency is shown to bring about further energy savings, but it demands denser deployment of BSs. Thus, it is not deemed as economically viable considering today’s cost values.

7. Conclusions

In this paper, we presented a novel methodology to assess the economic viability of the technical solutions for energy efficient wireless access networks. We demonstrated the usability of the proposed methodology by performing cost-benefit analysis for two different energy efficient solutions applicable to existing and greenfield deployment scenarios. Regarding the hardware upgrade solution, we considered dynamic sleep mode operation of BSs, namely cell DTX. Based on the loaddependent performance evaluation, we have quantified the achievable energy saving of the hardware upgrade with the cell DTX feature. Then, we derived the break-even cost of the new hardware below which the increment in CAPEX is compensated by the reduced energy cost. It is shown that up to 60% of cost saving is achievable with the cell DTX by taking advantage of low resource utilization in the current networks due to the high data rate requirements. Consequently, the resulted energy cost saving via hardware upgrade can compensate the required investment, and thus brings the total cost saving, when the additional hardware cost for each BS is lower than 8% of unit CAPEX in the countries with energy cost of 0.1 €/kWh.