403: The centralized controller boosts a second RS transmit power corresponding to each of the n RRUs to a corresponding first RS transmit power, and enables each of the n RRUs to send an RS at the corresponding first RS transmit power.

An execution sequence of step 402 and step 403 is not limited.

It should be noted that, the downlink coverage of the cell depends on a value of a downlink RSRP of the cell. After the RS transmit power of the RRU is boosted, the value of the downlink RSRP of the cell increases. In this case, some RRUs in the m RRUs can satisfy a downlink coverage requirement of the cell, Therefore, other RRUs can be turned off, to reduce power consumption of the communications system. For example, referring to FIG. 5, all six RRUs need to be turned on to cover 12 terminals in the figure before RS transmit powers of the RRUs are boosted. Only three of the six RRUs are turned on to cover the 12 terminals in the figure after the RS transmit powers of the RRUs are boosted. Therefore, the other three RRUs may be turned off to reduce the power consumption of the communications system.

In a specific implementation of step 403, the RS transmit power of the RRU may be boosted in either of the following two manners:

Manner 1: The centralized controller reduces a data transmit power and increases the RS transmit power, to boost the second RS transmit power corresponding to each of the n RRUs to the corresponding first RS transmit power.

When this application is applied to the scenario shown in FIG. 1, the centralized controller may evenly allocate a reduced data transmit power to all RSs sent by the BBU,