TD-LTE关键技术与网络规划策略

TD-LTE采用了正交频分复用(OFDM)、多入多出(MIMO)等关键技术,较2G/3G在物理层空口传输有了本质变化,因此,其网络规划策略也随之改变.首先,TD-LTE的帧结构同TD SCDMA有较大不同;其次,由于采用了OFDM技术,TD-LTE的主要干扰来自于相邻小区的小区间同频干扰;同时,TD-LTE采用多种的MIMO技术,如分集、复用及波束成形等,从而对规划设计方法带来影响.本文全面研究了TD-LTE关键技术对规划设计方法的影响并提出了相应应对策略,对TD-LTE组网及规模建设均起到指导作用.

Key technologies and network planning strategies of TD-LTE system

TD-LTE systems changes a lot with GSM and 3G systems by employing frequency division multiplexing(OFDM),multiple input multiple output(MIMO) and other physical layer transmission key technologies.Therefore,its network planning strategies are also changed.First of all,the frame configuration of TD-LTE are differ from TD-SCDMA;secondly,thank for the OFDM technology,the intra-cell interference of TDLTE can be ignored and main interference is mostly caused by the inter-cell.Thirdly,the planning design methods are affected by the adoption of different MIMO technologies,such as diversity,multiplexing and beam-forming.The key technology of TD-LTE on the planning and design method influence and solutions are studied and some solutions are given in this paper.