NAS message processing method and device and storage medium

Abstract

The invention discloses an NAS message processing method and a device thereof and a storage medium, and the method comprises the steps: searching a fault-tolerant window according to a security header of a first NAS message, wherein the fault-tolerant window comprises security headers of N second NAS messages received before the first NAS message, and N is an integer greater than 1; when the fault-tolerant window comprises the security header of the first NAS message, discarding the first NAS message; and when the fault-tolerant window does not include the security header of the first NAS message, processing the first NAS message. The fault-tolerant window is constructed, the fault-tolerant window is used for carrying out fault-tolerant judgment on the received first NAS message, and the NAS message which is sent first and then sent second is identified, so that the probability that the message is discarded as a replay message is reduced, namely, the probability of missed and missed messages is reduced. In an ideal condition, the influence of message mistakes and omissions and message disorder on NAS message processing can be completely avoided.

Description

technical field [0001] The present application relates to communication technologies, and in particular to a NAS message processing method, device and storage medium. Background technique [0002] like figure 1 As shown, the agreement of the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) stipulates that if the security context exists, the access and movement of the terminal device 120 non-access stratum (Non-Access Stratum, NAS) and the network device 110 The uplink and downlink NAS messages exchanged between management functions (Access and Mobility Management Function, AMF) need the security context for security protection. A pair of important parameters NAS COUNT (NAS message count value) are respectively stored in the security context of the terminal device 120 and the network device 110, wherein the terminal device 120 is responsible for maintaining the uplink NAS COUNT, which is used to protect the uplink NAS message count value; the net...

AI Technical Summary

Problems solved by technology

From the perspective of the sender, the messages are sent in ascending order according to the NAS message count value, but in actual operation, the messages are passed through layers, and it is very likely that the downlink NAS messages sent by the AMF are sent first and then arrive. That is, it may happen that the NAS message count value in the downlink NAS message received by the terminal device is smaller than the previously received NAS message count value, resulting in the downlink NAS message received later being considered as a replay message and discarded without processing. misinformation

Therefore, the existing NAS message processing methods need to be optimized

Images