LTE-A异构网络中节能算法的研究
发布时间：2018-11-20 04:20
【摘要】：近年来地球面临着越来越严峻的环境问题,节能、降耗、减排成为了大势所趋。随着移动通信系统的高速发展,日益壮大的网络规模,数以千万的基站数目,将通信行业的耗电量推向了历史的高峰,为通信运营商带来经济负担的同时也为环境带来了不可小觑的污染。因此,化解通信发展与环境污染之间的矛盾成为了通信行业的一大重点。如何节能减排、降低能耗、实现绿色通信已成为通信业研究的一个热点。特别是随着LTE/LTE-A蜂窝网的推广应用,业界越来越关注通信网络节能技术的研究,并在LTE的标准中提出了可行的节能解决方案。在这样的大环境下,本文结合LTE标准中的节能方案,采用小区扩展技术与频率复用、功率协调技术设计了两种场景下的高效节能算法。其一,针对LTE-A单小区两层异构网络,采用小区扩展技术,扩大微小区接入容量,分担宏基站负载,均衡小区负载;同时,采用软频率复用技术,有效隔离干扰频带,保证频谱效率的同时抑制了层间干扰;出于节能的考虑,加入功率控制策略,在保证用户传输速率的条件下,尽可能使用小功率接入。在此基础上设计出RE-PFIC节能算法,不仅能有效抑制层间干扰,提高系统吞吐率,还能减少功率消耗,从而提高系统能效。受业务中断概率的约束,小区扩展偏移量(bias)不可无限增大,RE-PFIC算法在一定的bias范围内有效。因此,本文通过仿真在验证RE-PFIC算法的有效性的同时给出了有效的bias范围。其二,针对LTE-A多小区异构蜂窝网络,沿用单小区场景下的RE-PFIC节能算法,在小区内部使用能效的运行机制;同时,根据小区功率占用特点,在基站端通过开关基站的方式节省固定能耗,设计了基于覆盖补偿的基站开关算法。该算法考虑了多小区间的干扰抑制和关基站引起的空洞覆盖补偿问题,根据一天内的流量负载模型,在保证用户传输速率和低业务中断概率的条件下,以最大化节能态基站数和最小化补偿态基站数为目标,采用启发式算法开关基站,实现了显著高于传统全频率复用网络的节能效率。本文针对单小区和多小区异构蜂窝网场景设计出的两种节能机制,都是基于保证用户传输速率和较低业务中断概率的。这两种算法分别提高了网络侧能效和能量利用率,具有良好的节能效果,实现了绿色通信的目标。
[Abstract]:In recent years, the earth is facing more and more severe environmental problems, energy conservation, consumption reduction, emission reduction has become the general trend. With the rapid development of the mobile communication system, the growing network scale and the number of tens of millions of base stations have pushed the power consumption of the communication industry to a historical peak. While bringing economic burden to the communication operators, it also brings the pollution that can not be underestimated for the environment. Therefore, resolving the contradiction between communication development and environmental pollution has become a major focus of the communications industry. How to save energy, reduce energy consumption and realize green communication has become a hot spot in communication industry. Especially with the popularization and application of LTE/LTE-A cellular network, the industry pays more and more attention to the research of communication network energy saving technology, and puts forward a feasible energy saving solution in the standard of LTE. In such a large environment, combining with the energy saving scheme in LTE standard, this paper designs an efficient energy-saving algorithm in two scenarios by using cell expansion technology, frequency reuse and power coordination technology. Firstly, aiming at the LTE-A single cell two-layer heterogeneous network, the cell expansion technology is adopted to expand the access capacity of the microcell, share the load of the macro base station and balance the load of the cell. At the same time, the soft frequency multiplexing technology is used to isolate the interference band effectively, which ensures the spectrum efficiency and suppresses the interlayer interference. In order to save energy, the power control strategy is added to ensure the transmission rate of the user and to use small power access as much as possible. On this basis, the RE-PFIC energy-saving algorithm is designed, which can not only effectively suppress interlayer interference, improve the system throughput, but also reduce power consumption, thus improving the system energy efficiency. Restricted by the outage probability, the cell extension offset (bias) can not be increased indefinitely, and the RE-PFIC algorithm is effective in a certain range of bias. Therefore, the validity of RE-PFIC algorithm is verified by simulation, and the effective range of bias is given at the same time. Secondly, for the LTE-A multi-cell heterogeneous cellular network, using the RE-PFIC energy-saving algorithm under the single cell scenario, using the energy efficiency operation mechanism in the cell; At the same time, according to the characteristics of cell power occupation, the fixed energy consumption is saved by switching the base station at the base station, and a base station switching algorithm based on coverage compensation is designed. The algorithm takes into account the interference suppression of multi-cell and the cavity coverage compensation caused by closing base station. According to the traffic load model in one day, it can guarantee the user transmission rate and the low probability of service outage. Aiming at maximizing the number of energy-saving state base stations and minimizing the number of compensated state base stations, a heuristic algorithm is used to switch the base stations, which achieves a significantly higher energy-saving efficiency than the traditional full-frequency multiplexing network. In this paper, two energy saving mechanisms are designed for single cell and multi-cell heterogeneous cellular networks, both of which are based on the guarantee of user transmission rate and low service outage probability. These two algorithms improve the energy efficiency and energy utilization ratio of network side, and achieve the goal of green communication.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：2343701
[Abstract]:In recent years, the earth is facing more and more severe environmental problems, energy conservation, consumption reduction, emission reduction has become the general trend. With the rapid development of the mobile communication system, the growing network scale and the number of tens of millions of base stations have pushed the power consumption of the communication industry to a historical peak. While bringing economic burden to the communication operators, it also brings the pollution that can not be underestimated for the environment. Therefore, resolving the contradiction between communication development and environmental pollution has become a major focus of the communications industry. How to save energy, reduce energy consumption and realize green communication has become a hot spot in communication industry. Especially with the popularization and application of LTE/LTE-A cellular network, the industry pays more and more attention to the research of communication network energy saving technology, and puts forward a feasible energy saving solution in the standard of LTE. In such a large environment, combining with the energy saving scheme in LTE standard, this paper designs an efficient energy-saving algorithm in two scenarios by using cell expansion technology, frequency reuse and power coordination technology. Firstly, aiming at the LTE-A single cell two-layer heterogeneous network, the cell expansion technology is adopted to expand the access capacity of the microcell, share the load of the macro base station and balance the load of the cell. At the same time, the soft frequency multiplexing technology is used to isolate the interference band effectively, which ensures the spectrum efficiency and suppresses the interlayer interference. In order to save energy, the power control strategy is added to ensure the transmission rate of the user and to use small power access as much as possible. On this basis, the RE-PFIC energy-saving algorithm is designed, which can not only effectively suppress interlayer interference, improve the system throughput, but also reduce power consumption, thus improving the system energy efficiency. Restricted by the outage probability, the cell extension offset (bias) can not be increased indefinitely, and the RE-PFIC algorithm is effective in a certain range of bias. Therefore, the validity of RE-PFIC algorithm is verified by simulation, and the effective range of bias is given at the same time. Secondly, for the LTE-A multi-cell heterogeneous cellular network, using the RE-PFIC energy-saving algorithm under the single cell scenario, using the energy efficiency operation mechanism in the cell; At the same time, according to the characteristics of cell power occupation, the fixed energy consumption is saved by switching the base station at the base station, and a base station switching algorithm based on coverage compensation is designed. The algorithm takes into account the interference suppression of multi-cell and the cavity coverage compensation caused by closing base station. According to the traffic load model in one day, it can guarantee the user transmission rate and the low probability of service outage. Aiming at maximizing the number of energy-saving state base stations and minimizing the number of compensated state base stations, a heuristic algorithm is used to switch the base stations, which achieves a significantly higher energy-saving efficiency than the traditional full-frequency multiplexing network. In this paper, two energy saving mechanisms are designed for single cell and multi-cell heterogeneous cellular networks, both of which are based on the guarantee of user transmission rate and low service outage probability. These two algorithms improve the energy efficiency and energy utilization ratio of network side, and achieve the goal of green communication.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
【参考文献】
中国期刊全文数据库 前2条
1 肖潇;陶晓明;陆建华;;基于高能效无线接入网的绿色无线通信关键技术研究[J];电信科学;2011年11期
2 郝高麟;;利用微蜂窝技术解决小区覆盖瓶颈方案[J];通信与信息技术;2011年01期
，本文编号：2343701
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