In the LampSite scenario, an energy saving method is as fellows: During light-traffic hours, a pRRU at an entrance/exit or a key gateway of a building is kept powered on, a logical cell to which the pRRU belongs is enabled, and service monitoring is performed in real time. As a user moves, another pRRU is remotely powered on. In this way, a network is enabled when the user comes. When the user leaves an indoor area, the pRRU is powered off In this way, the network is disabled when the user leaves. In LTE standard, because random access is not initiated when a terminal camps on a cell, the terminal may not be detected. If a pRRU in a specific position is improperly selected, the terminal may not be detected either.

An embodiment of this application provides a schematic structural diagram of hardware of an energy saving apparatus 30. As shown in FIG. 3, the energy saving apparatus 30 may be a centralized controller in the following. The energy saving apparatus 30 includes a processor 301, a communications bus 302, a memory 303, and at least one communications interface 304.

The processor 301 may be one or more general-purpose central processing units (CPU), a microprocessor, an application-specific integrated circuit (SIC), or one or more integrated circuits configured to control program execution in the solutions in this application.

The communications bus 302 is used for communication among the foregoing components, to transmit information.

The communications interface 304 may use any apparatus of a transceiver type and is configured to communicate with another device or a communications network, for example, the Ethernet, a radio access network (RAN), a wireless local area network (WLAN).