In a possible implementation, the energy saving apparatus further includes a communications unit. The processing unit is specifically configured to: measure uplink RSRPs, of the first terminal, corresponding to the m RRUs, where an uplink RSRP, of the first terminal, corresponding to one RRU is a received power that is measured by the energy saving apparatus and that is of an SRS sent by the first terminal through the RRU, and the first terminal is any one of the plurality of terminals; receive, through the communications unit, information that is sent by the first terminal and that is about a sum of second downlink RSRPs, of the first terminal, corresponding to the m RRUs; and determine a second downlink RSRP, of the first terminal, corresponding to the first RRU, based on the uplink RSRPs, of the first terminal, corresponding to them RRUs and the information about the sum of the second downlink RSRPs, of the first terminal, corresponding to the m RRUs, where the first RRU is any one of the m RRUs.

In a possible implementation, the processing unit is specifically configured to: determine, based on a preset algorithm, a linear value of the second downlink RSRP, of the first terminal, corresponding to the first RRU, where the preset algorithm is

$\frac{S_{\mathrm{uplink}??\mathrm{RSRP}}}{\mathrm{RSRP}??1^{\prime }}=\frac{S_{}}{}$