Study Of Energy Saving Algorithm In LTE-A Heterogeneous Network

In recent years, the earth is facing more and more serious environment problem, energy saving, consumption reduction, emission reduction has become the trend of The Times. With the rapid development of mobile communication systems, fast growing network scale and tens of millions of base stations, the power consumption of the communications industry has reached a peak over the history. Such a phenomenon not only brings economic burden for telecommunication operators but also brings pollution to the environment. Therefore, solving the conflicts between communication development and environmental pollution has become a major focus of the communications industry. How to reduce the energy consumption, save energy, reduce emission to implement green communications has become a hot spot in the research of the telecommunication industry. Especially with the application of LTE/LTE- A cellular network, the industry pay more and more attention to the study of communication network energy saving technology, and puts forward feasible energy-saving solutions in LTE standard. Based on these energy saving plans, we use the district extension technology, coordination with frequency reuse and power technology to design the high efficiency and energy saving algorithms under two scenarios.First, in view of the LTE- A single village two-layer heterogeneous network, we use the cell expansion technology to enlarge access capacity of microcell and share the Macrocell load to balance cell load. We also use the soft frequency reuse technology to isolate the interference band effectively to ensure that the spectrum efficiency and suppress the interlayer interference at the same time. Considering the energy saving, we employ the power control strategy to use low power base station to join in under the condition of guaranteeing user transmission rate. Based on the technology above we design out an energy saving algorithm RE- PFIC, which can not only restrain interlayer interference effectively, but also improve the system throughput, reduce power consumption, so as to improve system efficiency. Bound by the business interruption probability, cell range extension offset increases indefinitely(bias) and the RE- PFIC algorithm is effectively within a certain bias. Therefore, in this article, we simulate to verify the validity of the algorithm RE- PFIC and give out the effective scope of bias simultaneously.Second, for the multi-cell heterogeneous LTE-A cellular network, follow the RE-PFIC saving algorithm for single-cell scenarios, we use the energy-efficient operation mechanism within the cell. Meanwhile, according to district power usage characteristics, we switch the base station to save fixed energy and design out a base station switching algorithm based on covering compensation. The algorithm takes interference suppression caused between multi-cell and compensation coverage hole caused by taking off the base station into account. According to the traffic load models within a day, we employ Heuristic algorithm to switch base stations aiming to maximize the number of energy-saving base stations and minimize the number of compensation base stations under ensuring the user transfer rates and low business interruption probability. At last, this algorithm improves the energy-saving efficiency significantly higher than the traditional full frequency reuse network scenarios.These two energy saving mechanisms for the heterogeneous scenes of single-cell and multi-cells in this paper is both based on the guaranteeing of user’s transmission rate and low probability of business interruption. These two algorithms, have improved the network energy efficiency and energy utilization respectively. It’s really a good energy saving effect which can achieve the goal of green communication.