At present

electronic fence and pseudo-base station are the main equipment of information collection in public security system. They are often distributed in the area of dense flow of people

which can easily affect the quality of communication network and bring negative influence to the brand and economic benefit of operator. It is more and more urgent to set up information collection system which does not affect the communication network. This paper studies the backtracking direction of discrete trajectory modeling

using signaling handover data and base station handoff information

combined with big data model

such as sweep frequency

soft and hard signaling information

etc

to build a track location backtracking system for road mobile users. It can be used to collect information in public security system

controland reduce the number of electronic fence and pseudo-base station

and ensure the quality of communication network.