A process optimization method of AS safe mode in LTE system

Abstract

The invention discloses an AS security mode process optimization method in an LTE system. The method comprises: after the PDCP layer of the base station receives the target SDU corresponding to the security mode command message sent by the RRC layer of the base station, the MAC-I domain of the target SDU Add preset information in , get the first target SDU and send it to the target UE, so that the target UE can feed back the second target SDU corresponding to the security mode completion message; after the PDCP layer of the base station receives the SDU sent by the target UE, based on the SDU MAC‑I field information, determine whether the SDU is the second target SDU, and realize AS security mode process optimization. The PDCP layer of the base station of the present invention determines whether the SDU sent by the UE is the SDU corresponding to the security mode completion message based on the MAC-I domain information of the SDU, so as to avoid problems such as message discarding caused by misidentification and failure to decrypt the message in time, etc. call loss.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an AS security mode process optimization method in an LTE system. Background technique [0002] In view of the security features of the LTE (Long Term Evolution, long-term evolution) system, the AS (Access Stratum, access layer) needs to perform security mode command activation and security protection. During the AS security mode command process, the base station (eNodeB) and the user equipment (User Equipment, UE) negotiate the AS algorithm and calculate the AS integrity protection key and encryption key, and start the integrity protection and encryption. Integrity protection can ensure that the content of the message received by the receiver has not been tampered with by a third party, and encryption protection can change the content of the message sent by the sender so that no third party other than the target receiver can know the true content of the message. [0003]...

AI Technical Summary

Problems solved by technology

[0020] 1. The efficiency is low. The process of starting the safe mode requires the RRC layer and the PDCP layer to exchange messages multiple times.

When a large-capacity base station or a call is busy, the system overhead increases and the stability of the device decreases

[0021] 2. Due to the ASN.1 decoding at the RRC layer, after sending the Security Mode Command message in the downlink, the uplink cannot determine when the Security Mode Complete message is received, resulting in the NAS message not carrying the MAC-I and being discarded by the PDCP layer, causing call loss

[0022] 3. Due to the ASN.1 decoding at the RRC layer, when multiple messages including the Security Mode Command message are received in the downlink, the RRC layer will fail to decode the message after the Security Mode Command because the PDCP layer is not decrypted, causing a call. damage

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