High-speed user traceability method for LTE network based on FPGA+NPU

Abstract

The invention discloses a high-speed user traceability method for LTE network based on FPGA+NPU. Its main technical features are: shunting user signaling messages to the CPU module and shunting user data messages to the FPGA module; The user association information obtained after parsing is sent to the FPGA module and the NPU module, and the search of the user data message and the user information table is divided into two modules, the FPGA and the NPU; the CPU module obtains the user association information by analyzing the user signaling message At this time, the gateway address is learned; the FPGA module receives the user data message and sends the source IP+sink IP of the outer layer of the message to the TCAM attached to the FPGA module for matching to form an uplink and downlink mark, and the FPGA module searches for the user according to the uplink and downlink direction The information table performs field matching. If the matching is successful, the obtained user information will be filled in the user data message and output. If the matching fails, the user data message will be sent to the NPU module for the second matching. It has the advantages of fast, efficient and high-accuracy traceability.

Description

technical field [0001] The invention belongs to the technical field of network security, and in particular relates to an LTE network-oriented high-speed user traceability method based on FPGA+NPU. Background technique [0002] In the era of GSM and 3G networks, the network monitoring system will split the user data and user signaling from the wireless access network, and adopt the mode of front-end collector shunting and multiple back-end analysis machines to realize the traceability and correlation of user data. Entering the LTE era, LTE network, as a new generation of mobile communication technology, has undergone major changes in both the core network structure and wireless access technology. With the geometric growth in the number of network users and data traffic, LTE The core network (EPC) uses a variety of different protocols, such as GTP, SCTP, etc., to complete functions such as user access, security authentication, and mobile management, and these protocols are use...

AI Technical Summary

Problems solved by technology

[0003] In the background technology, the Chinese patent "A user traceability association method and front-end collector for LTE network" (patent number: 201510887134.4) proposes a user traceability association method and front-end collector for LTE network. The technical solution is to Signaling analysis processing and user traceability association are implemented in the front-end collector to meet the increasing number of network users and data traffic requirements, and solve the problem of excessive load on the background analysis machine. However, this solution mainly has two shortcomings:

[0004] 1. When the FPGA receives the associated information to generate the user information lookup table, it cannot manage the conflicting items in the user information lookup table, resulting in the inability to trace the source of the user data packets corresponding to the conflicting items;

[0005] 2. The user data message cannot directly determine the source IP, sink IP or user IP address, so when searching the user information lookup table, it may need to search twice before the search is successful;

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