With the development of mobile communication

the delay requirement of line service is lower and lower. In this paper

aiming at the realization of low delay characteristics of 5 G line service

the infl uence of network architecture and slicing on delay is analyzed in detail

and the corresponding realization scheme of low delay characteristics is proposed. In order to reduce the line delay

the network is reconstructed as CU-DU-AAU

and the placement of CU sinks. Device forwarding delay can be reduced through the fast forwarding of Flex Ethernet. Through hard channel isolation

packet loss caused by bandwidth preemption can be avoided

traffi c congestion can be reduced

and low delay characteristics of 5 G line service can be realized.