With the increasing demand for low bandwidth and low latency services in the 5G+vertical industry,the 5 Gbit/s granularity hard slicing of Slice Packet Network(SPN)can no longer meet the current requirements for low bandwidth.Therefore,it is necessary to smoothly evolve the SPN slicing granularity to the Mbit/s level,making SPN fine-grained technology an inevitable choice for SPN development.As the SPN slicing granularity becomes smaller,the frame structure changes,and there is a growing demand for low la-tency in certain vertical industry applications,optimizing the cross-node latency becomes crucial in reducing latency.In this regard,this article analyzes the theoretical reasons for the increase in cross-node latency,tests and verifies the distribution of latency in 480 fine-grained time slots of intermediate nodes,and proposes a time slot selection mechanism that supports end-to-end low-latency transmission.Based on the distribution pattern of time slot latency,this mechanism provides a feasible solution to the time slot selection problem,and the results show that at loads of 25％,50％,and 75％,the time slot latency is reduced by 44.47％,29.18％,and 24.23％respectively,meeting the requirements for carrying low bandwidth and latency-sensitive services.
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