Research On Machanisms Of Energy Saving Of Flexible Access Management In Heterogeneous Cellular Networks Based On LTE

With mobile Internet developing,explosive mobile applications growing and new services, mobile communications network data traffic is growing demand for high speed.Communications industry in the history of human development, although not a new industry, but in recent years, high-tech communications to change the way communication is indeed evolve into a high-energy consumption industries. Proposed 3GPP LTE technology is a mobile communication system in order to meet the growing high-speed data services and system capacity requirements.The study revealed that the majority of wireless data services have taken place in an indoor environment. To solve this problem, Femto Forum and 3GPP LTE organizations was giving energy saving and interference coordination technology based on heterogeneous network of femtocells. There are many kinds of energy-saving policy, while data showed that the energy consumption of the entire mobile communications network equipment, the energy consumption of base station equipment accounted for 89%.This paper presents the main mode of heterogeneous cellular network, the high cost of energy consumption of the traditional macro base stations overlap deploy some low-power node, such as a home base station Femtocell is a pico base station, it appears to solve the macro base station coverage incomplete, and additional macro base station to bring enormous energy consumption problems. Flexible access is also IP-based network layer protocol, home base station uses "Super Link", that is, from the most simple conventional twisted-pair ADSL achieve transformation "last kilometer " access problem. The outside network connected to the interior. Like the telephone line as the home base station has a simple plug and play functionality. Not only can reduce system power consumption, but also improve the network coverage in users.Based on the premise of heterogeneous desire to consider the relationship further balance between network performance and energy consumption, both to meet the Qo S userservices, but also to meet low energy standards. Thus presented to the network access mechanism or network selection research. Sought between macro base stations and home base to get the best balance of energy efficiency. Thus proposes heterogeneous access network selection algorithm in a way multi-objective decision tradeoffs of various algorithms slightly superior. And accordingly the simulation, the results are tasting.Paper focuses on multi-objective decision theory, on this basis, the introduction of the energy efficiency of this factor, making energy model, using several different utility function construction algorithm decision, and based on the Analytic Hierarchy Process to the weight assignment, so choose better utility function to solve the problem based on user access heterogeneous cellular network based on energy efficiency.And same time,wireless network operators in order to meet the growing demand for mobile user network system capacity and transmission rate requirements, the deployment of a variety of network types and a variety of network structure. While so much of the network structure and network systems overlap within the scope of services to meet the user’s network basic requirement. But many of the network of railroads brought a lot of energy consumption on the environment caused tremendous damage. Therefore, we have to network operators on how to improve equipment energy saving issues be on the table. Mobile business in the time domain and airspace obvious imbalance. Airspace, some areas are too busy network overload caused by the base station energy consumption is too large, and in some areas, but the traffic is low so that the base station resources wasted too much idle. Some areas such as the city’s business circles led to the emergence of abortion ’tidal effect’ change over time. Because a lot of energy problems caused by these base stations, network operators will lead to its attention. With multi-service, multi-protocol energy conservation issues, the growth of multi-tasking cellular network, the cellular network is imperative. The base station of a cellular network, the annual energy consumption accounted for sixty percent overall, enables network operators to improve the energy efficiency of the base station is very enthusiastic. Throughout the cellular network system, traffic in the time domain to show a lot of flexibility, so how to make the network energy efficiency has become a hot issue.In order to maximize spectral efficiency, 3GPP networking tend to use the same frequency, so between macro base stations, with layer interference between femtocells and macro base stations and the cross-layer interference between femtocells an impact on heterogeneous cellular network an important factor in performance. Compared to the traditional macro cellular network, the home base station deployment random, closed user access, coverage enhancement and other technical characteristics, these benefits also make the interference situation is particularly complex heterogeneous networks. Inter-cell interference would seriously affect the overall performance of the system, in particular resulting in poor service quality cell edge user throughput is low appears. Therefore, how to manage heterogeneous cellular network interference, thus improving the efficiency of the cellular spectrum, making mobile communication system can improve indoor coverage within limited frequency resources and provide high-speed data services in a wireless communication problems to be solved.In recent years, Due to the presence of network traffic "tidal effect", the network system in the time domain and space domain issues. The base station equipment is generally desired peak to peak to design, but not all of the base stations have been busy all states. Therefore,when the network of base stations in a low power operation, a lot of resources to obtain the base station may not fully utilized, resulting in a lot of waste. So how to get the base station at the same time maintaining its network quality of service, so that the base station to enter a "sleep" will be the subject of our study. On the basis of the network quality of service,saving economic waste and environmental protection on the combination, we will base stations across the network, node, the mobile user terminal is modeled as a network topology map, do so. Then, based on this network topology, service quality, energy efficiency and low-carbon energy and so the overall draw optimization algorithms. the use of MATLAB software to simulate the mathematical model, and compared.