| 主权项 |
1. A sleep control method performed by a sleep controller in a wireless base station that includes a base band unit and a plurality of remote radio heads,
wherein the base band unit and the plurality of remote radio heads are connected by an optical network, which includes an optical line terminal and a plurality of optical network units, the optical line terminal being connected to the base band unit, the plurality of optical network units being connected to the optical line terminal via an optical transmission path and also connected to the plurality of remote radio heads in a one-to-one fashion, and wherein the sleep controller is included in the optical line terminal or the base band unit, the sleep control method comprising: acquiring information about usage bandwidths of the optical network units and information about cover areas currently set for the remote radio heads; setting a maximum cover area with respect to each remote radio head, the maximum cover area being a maximum range of cover area in which power consumption of one of the remote radio heads, in a case where the remaining remote radio head is set in a sleep state and the cover area of the one remote radio head is expanded to the cover area of the remote radio head set in the sleep state, does not exceed total power consumption of the remote radio heads in a case where the remaining remote radio head is not set in the sleep state; identifying the remaining remote radio head included in the currently-set cover areas within the maximum cover area of each remote radio head based on the information about the cover areas and the maximum cover area; determining whether or not a combination of the plurality of optical network units, a total usage bandwidth of which is smaller than or equal to an amount of traffic accommodatable by a single optical network unit, is identifiable based on the information about the usage bandwidths, and identifying the combination as a sleep candidate optical network unit group if the combination is identifiable; and selecting the optical network unit and the remote radio head to be switched to the sleep state, wherein if the maximum cover area of the remote radio head connected to one of the optical network units included in the sleep candidate optical network unit group includes a current cover area of the remote radio head connected to the remaining optical network unit included in the sleep candidate optical network unit group, the remaining optical network unit and the remote radio head connected to the remaining optical network unit are selected as the optical network unit and the remote radio head to be switched to the sleep state. |
