Method, device and system for processing safe key in reconnection of RRC (Radio Resource Control)

Abstract

The invention provides a method for processing a safe key in reconnection of RRC (Radio Resource Control). The method comprises the steps of: receiving a request for the reconnection of radio resource control from user equipment by a node B; making a self-judgment on whether the node B is a source node B or a target node B and judging whether a new safe key for an access layer is required to be created or not by the node B; if the node B is judged to be a source node B and the request for the reconnection of the radio resource control is caused by a non-safety problem or that the count value of the next hop link saved locally is not zero, maintaining to use the original safe key for the access layer and the previous security configuration for local configuration; and sending a corresponding message for the reconnection of the radio resource control to the user equipment so that the user equipment can complete reconnection. In the method, a judging step is added in the creating processof the safe key for the access layer, and thus, the problem that new safe keys are created regardless of conditions in the traditional method, a plurality of procedures for creating and calculating the safe key are omitted, and the time delay of the system is reduced.

Description

technical field [0001] The invention relates to the field of mobile communication security, in particular to a security key processing method, device and system when an RRC (Radio Resource Control, radio resource control) connection is re-established. Background technique [0002] In the LTE system, the RRC function of the network is performed in the eNB (E-UTRAN NodeB, Evolved Universal Terrestrial Radio Access Network Node B), so the corresponding security protection mechanism of RRC is also located in the eNB. Due to the large number of eNBs deployed and the wide distribution area, each network entity between the access layers is highly decentralized both geographically and logically, and operators cannot implement centralized security control over them, and each eNB is in a non-secure environment. area, so each eNB needs to generate its own key for the access layer security mechanism with each UE (User Equipment, user equipment). [0003] According to the description of...

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Problems solved by technology

[0008] The present invention is proposed aiming at the problem of renewing the key regardless of the situation in the above-mentioned prior art. For this reason, the main purpose of the present invention is to provide a method for processing the security key when the RRC connection is re-established, so as to perform key update for different situations. rekey

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