Sleep Mode Strategy for Energy Saving on 3G Network

Cellular telecommunication services are basic needs both in developed and developing countries. Recently, most multimedia and video traffic are transmitted on cellular telecommunication infrastructure. These traffic cause providers to increase their infrastructure capacity. The increased capacity on the other hand will increase their energy usage. However the infrastructure is not used at its fully capacity for twenty four hours. Therefore this paper will investigate traffic profile of 3G system of one telecommunication provider in a District of West Denpasar City for two months in order to analyze its energy usage. The research analyzes energy consumption of 29 of 3G base stations. Then traffic profile of workday and weekend were captured. The lowest traffic was found from 03:0:0 AM to 05:0:0 AM everyday on workday and weekend. Thus sleep mode method was proposed to apply for all 3G base stations during these hours. The results showed that the sleep mode implementation could reduce its energy consumption significantly up to 3,374 kW a year. In addition there was improvement on Area Power Consumption (APC) ratio about 146.487 W/km2 and 111.98 W/km2 on both months respectively. On the other side, during the sleep mode implementation, the coverage of 3G services reduces up to 3.10%. However, the reduction on 3G coverage could be substituted by 2G services. As a result the provider could maintain its services quality.