TD-LTE关键技术与网络规划策略

Key technologies and network planning strategies of TD-LTE system

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。

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 txansmission 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 TD- LTE 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 raethod influence and solutions are studied and some solutions are given in this paper.