Secret key management method, authorization checking method and device

Abstract

The embodiment of the invention provides a secret key management method, an authorization checking method and a device. The secret key management method comprises the steps of: receiving a RRC (Radio Resource Control) connection rebuilding request sent by UE (User Equipment) after a radio link failure occurs in a communication process of the UE and a first RN (Relay Node); judging whether the first RN is affiliated to a base station; if so, checking whether the RRC connection rebuilding request is authorized or not by the first RN; and if the RRC connection rebuilding request is authorized, calculating an access layer secret key according to KeNB* (Key Evolved Node B) of a target cell and a security algorithm of the target cell. By means of the method and the device provided by the embodiment of the invention, an RRC connection rebuilding failure and call drop caused by that the target cell dispenses with secret keys and other security parameters are avoided in a process in which the UE initiates the RRC connection rebuilding to cells affiliated to a DeNB (Donor eNB) or other RNs affiliated to the same DeNB when the UE undergoes the RLF under an RN scene.

Description

technical field [0001] The invention relates to the network field, and in particular designs a key management method, a check authorization method and a device. Background technique [0002] RN (Relay Node, relay node) is a site that relays data between base stations and terminals. RN can be deployed in urban areas to enhance hotspot coverage, so that wireless signals can reach their destinations through multiple transmissions (multi-hops). As shown in FIG. 1 , the RN and the DeNB (Donor eNB, eNB to which the RN belongs) have the same physical identity, and the RN can be regarded as a cell under the DeNB. [0003] Currently, when a radio link failure (RLF, Radio Link Failure) occurs in a UE (User Equipment, user equipment), the UE needs to perform cell measurement and reselect a cell to initiate an RRC (Radio Resource Control, radio resource control) connection reestablishment process. [0004] In the prior art, in the RN scenario, since the RN is often used to enhance hots...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, in the RN scenario, since the RN is often used to enhance hotspot coverage, the coverage areas of the RN and the DeNB overlap, and there may be only one cell under the RN, so when the UE under the RN has RLF, it is likely to choose the DeNB RRC connection re-establishment is performed on the cell of the same DeNB or other RN cells under the same DeNB, which will cause the RRC connection re-establishment to fail, resulting in call drop

In addition, in another scenario, when RLF occurs to the UE under the DeNB, the UE will select the cell of the RN under the DeNB to reestablish the RRC connection, which will also cause the failure of the RRC connection reestablishment, resulting in call drop

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