| 基于LTE单频网拆分算法的研究 |
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| 引用本文： | 邱仁建,王晓湘,唐明威,张鸿涛.基于LTE单频网拆分算法的研究[J].成都信息工程学院学报,2011,26(3):265-271. |
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| 作者姓名： | 邱仁建 王晓湘 唐明威 张鸿涛 |
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| 作者单位： | 北京邮电大学信息与通信工程学院,北京,100083 |
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| 摘 要： | 单频网中所有基站以相同的时频资源发送相同信号,对于单频网内某一用户,来自不同基站信号的传输时延不同,可能会出现符号间干扰。因此LTE设计了较长的循环前缀保证用户能够有效合并来自不同基站的信号。但是,当单频网区域过大时,部分基站的传输时延会超过循环前缀长度,产生符号间干扰,导致单频网性能下降。提出基于最大传输时延差或有效基站比例的单频网拆分算法,将区域过大的单频网拆分成多个子单频网,减少单频网内的符号间干扰,实现单频网数目和多播性能之间的合理折衷,以少量单频网数目为代价,提高单频网的覆盖率和吞吐量。仿真结果显示新的拆分算法在满足多播业务覆盖率的同时大大提高了系统吞吐量,验证了单频网拆分算法的有效性。
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| 关 键 词： | 单频网拆分 符号间干扰 基站最大传输时延差 有效基站比例 |
Research on LTE Single Frequency Network Split Algorithm |
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| QIU Ren-jian
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WANG Xiao-xiang
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TANG Ming-wei
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ZHANG Hong-tao.Research on LTE Single Frequency Network Split Algorithm[J].Journal of Chengdu University of Information Technology,2011,26(3):265-271. |
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| Authors: | QIU Ren-jian WANG Xiao-xiang TANG Ming-wei ZHANG Hong-tao |
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| Institution: | (Information and Communication Engineering School,Beijing University of Posts and Telecommunications,Beijing 100083,China) |
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| Abstract: | In SFN（Single Frequency Network）, all the base stations transfer the same service on the same time-frequency resource. For the user in SFN, the signals from different base stations have different transmission delay which may increase ISI（Inter Symbol Interference）. LTE has designed longer CP（Cyclic Prefix） to guarantee the users to combine signals from different base stations effectively. However, as the SFN larger, some base stations＇ transmission will exceed the CP length that will produce ISI, and then the performance of the SFN will become worse. In this paper, we propose the SFN spite algorithm based on the biggest base station transmission delay difference or the ef- fective base station proportion, which split the too large SFN into several sub-SFNs, decrease the ISI and realize the reasonable compromise between the number and performance of SFN, improve the coverage and throughput. The simulation illustrate the new spilt algorithm could improve the throughput of the SFN and maintain the services＇ coverage, prove the effectiveness of the SFN split algorithm. |
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| Keywords: | SFN split ISI the biggest base station transmission delay difference the effective base station proportion |
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