Method for reducing power consumption of base station in wireless communication system

A method for reducing power consumption by a lower base station in a wireless communication system, the method comprising:

• receiving a cell activation request instructing to perform a turn-on operation from an upper base station when operating in an energy saving mode;
• performing the turn-on operation according to the cell activation request;
• upon receiving, from the upper base station, a cell deactivation request instructing to perform a turn-off operation for entry back into the energy saving mode, performing the turn-off operation;
• and
• upon receiving a handover request from the upper base station, performing the handover for a User Equipment (UE) located within the cell coverage of the upper base station,
• wherein the upper base station has cell coverage including cell coverage of the lower base station, and the lower base station is included in the cell coverage of the upper base station, and
• wherein the cell deactivation request is received if the lower base station is determined as a turn-off target base station, the turn-off target base station being determined based on a Radio Resource Control (RRC) measurement report including information on signaling detected by the UE.

An upper base station in a wireless communication system, the upper base station comprising:

• a receiver for receiving, from a User Equipment (UE) located within the cell coverage of the upper base station, a Radio Resource Control (RRC) measurement report including information on signaling detected by the UE;
• a controller for determining at least one turn-off target base station among the lower base stations turned-on, based on the information included in the RRC measurement report, and performing the handover for the UE to a lower base station turned on;
• and
• a base station interface unit for transmitting a cell activation request instructing to perform a turn-on operation to all lower base stations operating in an energy saving mode located within a cell coverage of the upper base station, and for transmitting a cell deactivation request instructing to perform a turn-off operation for entry back into the energy saving mode to the at least one turn-off target base station,
• wherein the upper base station has cell coverage including cell coverage of the lower base stations, and the lower base stations are included in the cell coverage of the upper base station.

A lower base station in a wireless communication system, the lower base station comprising:

• a base station interface unit for receiving a cell activation request instructing to perform a turn-on operation from an upper base station, the lower base station operating in an energy saving mode;
• and
• a controller for performing the turn-on operation according to the temporary cell activation request, and for, upon receiving a cell deactivation request instructing to perform a turn-off operation for entry back into the energy saving mode from the upper base station through the base station interface unit, performing the turn-off operation, upon receiving a handover request from the upper base station, performing the handover for a User Equipment (UE) located within the cell coverage of the upper base station,
• wherein the upper base station has cell coverage including cell coverage of the lower base station, and the lower base station is included in the cell coverage of the upper base station, and
• wherein the cell deactivation request is received if the lower base station is determined as a turn-off target base station, the turn-off target base station being determined based on a Radio Resource Control (RRC) measurement report including information on signaling detected by the UE.

A method for reducing power consumption by an upper base station in a wireless communication system, the method comprising:

• transmitting a temporary cell activation request instructing to perform a temporary turn-on operation for a preset period of time, to lower base stations operating in an energy saving mode located within a cell coverage of the upper base station;
• receiving a Radio Resource Control (RRC) measurement report from a User Equipment (UE) located within the cell coverage of the upper base station;
• determining at least one turn-on target base station among the lower base stations temporarily turned-on, based on the RRC measurement report;
• and
• transmitting, to the at least one turn-on target base station, a cell activation request instructing to perform a turn-on operation,
• wherein the upper base station has cell coverage including cell coverage of the lower base stations, and the lower base stations are included in the cell coverage of the upper base station.

A method for reducing power consumption by a lower base station in a wireless communication system, the method comprising:

• receiving, from an upper base station, a temporary cell activation request instructing to perform a temporary turn-on operation for a preset period of time when operating in an energy saving mode;
• performing the temporary turn-on operation according to the temporary cell activation request;
• and
• upon receiving, from the upper base station, a cell activation request instructing to perform a turn-on operation, and performing the turn-on operation,
• wherein the upper base station has cell coverage including cell coverage of the lower base station, and the lower base station is included in the cell coverage of the upper base station.

An upper base station in a wireless communication system, the upper base station comprising:

• a transmitter for transmitting a temporary cell activation request instructing to perform a temporary turn-on operation for a preset period of time, to lower base stations operating in an energy saving mode located within a cell coverage of the upper base station;
• a receiver for receiving a Radio Resource Control (RRC) measurement report from a User Equipment (UE) located within the cell coverage of the upper base station;
• and
• a controller for determining at least one turn-on target base station among the lower base stations temporarily turned-on, based on the RRC measurement report, and controlling to the transmitter for transmitting, to the at least one turn-on target base station, a cell activation request instructing to perform a turn-on operation,
• wherein the upper base station has cell coverage including cell coverage of the lower base stations, and the lower base stations are included in the cell coverage of the upper base station.

A lower base station in a wireless communication system, the lower base station comprising:

• a receiver for receiving, from an upper base station, a temporary cell activation request instructing to perform a temporary turn-on operation for a preset period of time when operating in an energy saving mode;
• and
• a controller for performing the temporary turn-on operation according to the temporary cell activation request, and upon receiving, from the upper base station, a cell activation request instructing to perform a turn-on operation, performing the turn-on operation,
• wherein the upper base station has cell coverage including cell coverage of the lower base station, and the lower base station is included in the cell coverage of the upper base station.