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

Abstract

The invention discloses a high-speed user tracing method for a LTE network based on FPGA+NPU. The main technical characteristic of the method is as follows: a user signaling message is shunted to a CPU module and a user data message is shunt to an FPGA module; the CPU module sends user association information acquired after analysis to the FPGA module and the NPU module, look-up of the user data message and a user information table is implemented via the FPGA module and the NPU module; when analyzing the user signaling message and acquiring the user association information, the CPU modules learns a gateway address; the FPGA module receives the user data message and sends the source IP and the host IP of the outer layer of the message to a plug-in TCAM of the FPGA module for matching to form uplink and downlink marks, the FPGA module looks up the user information table according to the uplink and downlink directions for performing field matching, if matching is successful, the acquireduser information is filled to the user data message and output, and if matching is failed, the user data message is sent to the NPU module for secondary matching. The method has the advantages of quick and efficient tracing, and high accuracy.

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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