Apparatus and method for controlling uplink power in wireless communication system

An apparatus for controlling an uplink (UL) power in a wireless communication system, the apparatus comprising:

• a transmitter/receiver configured to,
• receive and decode downlink (DL) data,
• transmit a feedback signal with respect to the DL data, and
• receive transmit power control (TPC) commands from active set cells, the active set cells including a serving cell;
• and
• a controller configured to,
• decode the TPC commands to generate a combined TPC command, in which the decoded TPC commands of the active set cells are combined,
• calculate a transmission error rate of a feedback signal with respect to the received DL data based on the decoded DL data,
• calculate a requested rate of transmit power increase of the serving cell when the combined TPC command requests power decrease based on the decoded TPC commands,
• determine a transmit power gain offset based on the transmission error rate and the requested rate of transmit power increase of the serving cell,
• determine an UL power for transmitting the feedback signal with respect to the received DL data based on the transmit power gain offset, and
• transmit the feedback signal based on the UL power.

A chip for wireless communication, the chip comprising:

• a transmitter/receiver configured to,
• receive downlink (DL) data,
• transmit a feedback signal with respect to the DL data based on an uplink (UL) power, and
• receive transmit power control (TPC) commands from active set cells, the active set cells including a serving cell, the TPC commands being commands instructing a user equipment (UE) to adjust power of an uplink (UL);
• a memory configured to store computer-readable instructions;
• and
• one or more processors configured to execute the computer-readable instructions such that the one or more processors are configured to,
• decode the TPC commands to generate a combined TPC command in which the decoded TPC commands of the active set cells are combined,
• calculate a requested rate of transmit power increase of the serving cell when the combined TPC command requests power decrease based on the decoded TPC commands,
• determine a transmit power gain offset by comparing the requested rate of transmit power increase of the serving cell with a first threshold value, and
• determine the UL power for transmitting the feedback signal with respect to the DL data based on the transmit power gain offset.