The invention discloses a fixed-mobile convergence network, which comprises a user layer, an access layer and a mobile
core network, wherein the user layer comprises a plurality of users; the access layer comprises an
access network and a fixed-mobile convergence gateway, and the users are accessed into the
access network; the
access network is accessed into the fixed-mobile convergence gateway; and the access layer also comprises a signing
server, the fixed-mobile convergence gateway is accessed into the signing
server, and the signing
server is accessed into the mobile
core network. The invention also provides a method for authenticating users in the network. The invention has the advantages that the network reduces the alteration degree of the prior network and can distinguish each user in the management network, and each user can independently select to use or not to use fixed-mobile convergence service; the network prevents unsubscribed users from being accessed into the
core network, thereby reducing the load of the core network; and the adoption of the signing server in the access layer can judge whether access points in the network belong to legal access points, thereby preventing the users from being connected to the network through illegal access points.