摘要
TD-LTE作为2大准4G技术标准之一,相比于3G能提供更大的容量、更高的数据速率和更低的用户面时延。为了满足用户日益增长的多媒体业务需求,TD-LTE中引入了增强的多媒体广播多播(E-MBMS)技术,接入网采用单频网传输模式,也就是一簇时间严格控同步的小区在相同的时频资源上发送同一多媒体数据。在接收端,将来自单频网内多个小区的信号进行合并,相比于单小区MBMS,MBSFN能有效地提高接收信噪比(SINR)和频谱效率。介绍了TD-LTE中E-MBMS的架构和其中的关键技术,详细地分析了目前的MBSFN区域配置算法,并总结了每种配置方式的优缺点。
TD-LTE as the last step toward the 4th generation（4G）of radio technologies is designed to increase the capacity and speed of mobile communications. In order to meet the customers ＇ growing demand for multimedia services, the enhanced multimedia broadcast/muhicast（E-MBMS） is introduced in TD-LTE, and MBSFN（ MBMS over a Single Frequency Network）transmission mode is used in the access network. In the SFN technology,all the tightly time-synchronized base stations transmit the same signal at the same time and over the same frequency channel to UEs. In this case,the transmissions received from multiple cells will,as seen from the UE, appear as a single transmission subject to severe multi-path propagation. The MBSFN transmission mode brings significant improvements in spectral efficiency（SE）and Signal to Interference plus Noise Ratio （SINR）compared with single cell MBMS transmission mode. In this paper,an overview of MBSFN architecture and the key technologies are presented firstly, and then the present Dynamic MBSFN technologies are investigated.
出处
《无线电通信技术》
2013年第5期6-10,共5页
Radio Communications Technology
基金
国家重大科技专项(2012ZX03004009)
重庆市教委优秀成果转化项目(Kjzh11206)
