LTE-A異構網絡中節(jié)能算法的研究
發(fā)布時間：2018-11-20 04:20
【摘要】：近年來地球面臨著越來越嚴峻的環(huán)境問題,節(jié)能、降耗、減排成為了大勢所趨。隨著移動通信系統(tǒng)的高速發(fā)展,日益壯大的網絡規(guī)模,數(shù)以千萬的基站數(shù)目,將通信行業(yè)的耗電量推向了歷史的高峰,為通信運營商帶來經濟負擔的同時也為環(huán)境帶來了不可小覷的污染。因此,化解通信發(fā)展與環(huán)境污染之間的矛盾成為了通信行業(yè)的一大重點。如何節(jié)能減排、降低能耗、實現(xiàn)綠色通信已成為通信業(yè)研究的一個熱點。特別是隨著LTE/LTE-A蜂窩網的推廣應用,業(yè)界越來越關注通信網絡節(jié)能技術的研究,并在LTE的標準中提出了可行的節(jié)能解決方案。在這樣的大環(huán)境下,本文結合LTE標準中的節(jié)能方案,采用小區(qū)擴展技術與頻率復用、功率協(xié)調技術設計了兩種場景下的高效節(jié)能算法。其一,針對LTE-A單小區(qū)兩層異構網絡,采用小區(qū)擴展技術,擴大微小區(qū)接入容量,分擔宏基站負載,均衡小區(qū)負載;同時,采用軟頻率復用技術,有效隔離干擾頻帶,保證頻譜效率的同時抑制了層間干擾;出于節(jié)能的考慮,加入功率控制策略,在保證用戶傳輸速率的條件下,盡可能使用小功率接入。在此基礎上設計出RE-PFIC節(jié)能算法,不僅能有效抑制層間干擾,提高系統(tǒng)吞吐率,還能減少功率消耗,從而提高系統(tǒng)能效。受業(yè)務中斷概率的約束,小區(qū)擴展偏移量(bias)不可無限增大,RE-PFIC算法在一定的bias范圍內有效。因此,本文通過仿真在驗證RE-PFIC算法的有效性的同時給出了有效的bias范圍。其二,針對LTE-A多小區(qū)異構蜂窩網絡,沿用單小區(qū)場景下的RE-PFIC節(jié)能算法,在小區(qū)內部使用能效的運行機制;同時,根據小區(qū)功率占用特點,在基站端通過開關基站的方式節(jié)省固定能耗,設計了基于覆蓋補償?shù)幕鹃_關算法。該算法考慮了多小區(qū)間的干擾抑制和關基站引起的空洞覆蓋補償問題,根據一天內的流量負載模型,在保證用戶傳輸速率和低業(yè)務中斷概率的條件下,以最大化節(jié)能態(tài)基站數(shù)和最小化補償態(tài)基站數(shù)為目標,采用啟發(fā)式算法開關基站,實現(xiàn)了顯著高于傳統(tǒng)全頻率復用網絡的節(jié)能效率。本文針對單小區(qū)和多小區(qū)異構蜂窩網場景設計出的兩種節(jié)能機制,都是基于保證用戶傳輸速率和較低業(yè)務中斷概率的。這兩種算法分別提高了網絡側能效和能量利用率,具有良好的節(jié)能效果,實現(xiàn)了綠色通信的目標。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5
本文編號：2343702
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5
【參考文獻】
相關期刊論文 前2條
1 肖瀟;陶曉明;陸建華;;基于高能效無線接入網的綠色無線通信關鍵技術研究[J];電信科學;2011年11期
2 郝高麟;;利用微蜂窩技術解決小區(qū)覆蓋瓶頸方案[J];通信與信息技術;2011年01期
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