uplink

It adopts time division duplex mode. It can be allocated bandwidth flexible and can adjust time slot base on different service types for uplink and downlink which increases bandwidth efficiency.

它采用时分双工的模式，可以灵活的分配带宽资源，并能根据业务类型自适应的调整上、下行分配的时隙数，提高了频谱利用率。

As TD-LTE system is based on time division duplex, the uplink and downlink channel reciprocity can be employed for smart antennas.

由于TD-LTE系统是以时分的方式实现，可以利用上下行信道的互易性更好的发挥智能天线的优势。

Both the air interface based on time division multiplex CDMA and the uplink synchronization techniques based on closed loop delay control are introduced. The influence of synchronization accuracy on bit error rate is analyzed.

介绍了时分复用码分多址空中接口和上行信号闭环延迟控制两项关键技术，分析了同步精度对比特误码率的影响。