Method and apparatus for performing network cooperative communication to distribute traffic in a wireless communication system

A user equipment (UE) in a wireless communication system, the UE comprising:

• a radio frequency (RF) unit;
• and
• at least one processor connected with the RF unit and configured to:
• control the RF unit to receive, via a higher layer, a first UE specific parameter PA or a first cell specific parameter PB, and a second UE specific parameter PA or a second cell specific Dara meter PB about a first power ratio between a downlink signal and a cell specific reference signal (CRS),
• control the RF unit to receive downlink control information (DCI) including third information about a second power ratio between a downlink data for the UE and a Multi-user Superposition Transmission (MUST) interference signal, and
• control the RF unit to receive the downlink signal based on a transmission power,
• wherein the transmission power is determined based on (i) a number of antenna ports for transmit diversity used for the downlink signal and (ii) one of the first PA or PB and the second PA or PB,
• wherein, based on the third information including a first value, the downlink signal includes the downlink data and does not include the MUST interference signal, and the first PA or PB is used for determining the transmission power of the UE not configured for MUST, and
• wherein, based on the third information including a value except the first value, the downlink signal includes the downlink data and the MUST interference signal and the second PA or PB is used for determining the transmission power of the UE configured for the MUST.