Abstract: The mobile communication network establishes a trust relationship between the network and the user equipment with authentication and key agreement. 5G network is a convergence network. User equipment can access the network through a variety of ways and it needs to authenticate with the network repeatedly when it is moving between two access networks. In the application environment of Internet of Thing, a group of user equipment with same characteristics and behaviors need to authenticate with the network one by one, which will over-consumes network resource and lowers access efficiency. To solve this problem, an authentication state identification mechanism is designed. If the user equipment successfully accesses the network, the network grants it a status identification. It can access the network with any way, no need access authentication again for a while. It also can transfer such an identification to the other members of the group, thus avoiding the authentication one by one. This mechanism can improve the efficiency of access, avoid the waste of resources and ensure the security network.