Information receiving method, information sending method, devices, and system

The invention discloses an information receiving method, an information sending method, devices and a system. When requesting to be connected to a network through an access point (AP), a mobile terminal respectively sends a communication signaling to an access controller (AC) and a broadband remote access server (BRAS) through the AP; the AC submits an acquired equipment identifier of the AP and an acquired terminal identifier of the mobile terminal to the BRAS through an established AC-BRAS tunnel; and after receiving the equipment identifier of the AP and the terminal identifier of the mobile terminal, the BRAS acquires user information and the terminal identifier of the mobile terminal through the AP and binds the user information corresponding to the terminal identifier of the mobile terminal with the equipment identifier of the AP, so that the BRAS can know the AP through which each user is connected to the network, and the user can be precisely positioned to the AP level; and therefore, wireless local area network (WLAN) differential services can be deployed and performed favorably.