5G 网路切片 移动边缘计算 空口 低时延Many application scenarios def i ned by 5G need low latency (5 ms~10 ms) or ultralow latency (1 ms~2 ms), such as remote operation and automatic driving. In order to discuss and investigate new technology to reduce latency, according to 5G application scenarios and key capabilities, the factors inf l uencing latency were analyzed from three aspects of the network architecture, air interface and bearing network. In addition, the applications of corresponding techniques to reduce 5G latency were brief l y analyzed. 5G network slicing MEC air interface low latency(广东省电信规划设计院有限公司,广东 广州 510630)(Guangdong Planning and Designing Institute of Telecommunications Co., Ltd., Guangzhou 510630, China)